15
Number 15 (fifteen) is an odd two-digits composite number and natural number following 14 and preceding 16.
| Nominal | 15 |
| Cardinal | fifteen |
| Ordinal | 15th |
| Number of digits | 2 |
| Sum of digits | 6 |
| Product of digits | 5 |
| Number parity | Odd |
Calculation was done in 0.0000400543 seconds
| Prime factorization | 3 x 5 |
| Prime factors | 3, 5 |
| Number of distinct prime factors ω(n) | 2 |
| Total number of prime factors Ω(n) | 2 |
| Sum of prime factors | 8 |
| Product of prime factors | 15 |
Calculation was done in 0.0000109673 seconds
| List of proper divisors | 1, 3, 5 |
| List of all dividers | 1, 3, 5, 15 |
| Number of divisors d(n) | 4 |
| Sum of all divisors σ(n) | 24 |
| Aliquot sum | 9 |
| 15 is a deficient number , since it is larger than the sum of its proper divisors (9). Its deficiency is 6. |
Calculation was done in 0.0000259876 seconds
| Is 15 a prime number? | No |
| Is 15 a semiprime number? | Yes |
| Is 15 a Chen prime number? | No |
| Is 15 a Mersenne prime number? | No |
Calculation was done in 0.0000112057 seconds
| Is 15 a Catalan number? | No |
| Is 15 a Fibonacci number? | No |
| Is 15 a Idoneal number? | Yes: I12 |
Calculation was done in 0.0000038147 seconds
| 15 is not a Happy number |
| 15 is a Humble number |
| 15 is not a Münchhausen number |
| 15 is not a Perfect number |
| 15 is not a Perfect square |
| 15 is not a Palindrome |
Calculation was done in 0.0052831173 seconds
| Base | System | Value |
|---|
| 2 | Binary | 11112 |
| 3 | Ternary | 1203 |
| 4 | Quaternary | 334 |
| 5 | Quinary | 305 |
| 6 | Senary | 236 |
| 7 | Septenary | 217 |
| 8 | Octal | 178 |
| 9 | Nonary | 169 |
| 10 | Decimal | 15 |
| 12 | Duodecimal | 1312 |
| 16 | Hexadecimal | f16 |
| 20 | Vigesimal | f20 |
| 36 | Base36 | f36 |
| 60 | Sexagesimal | F60 |
Calculation was done in 0.0000171661 seconds
| Square of 15 (n2) | 225 |
| Cube of 15 (n3) | 3375 |
| Square root of 15 | 3.8729833462074 |
| Natural Logarithm (ln) of 15 | 2.7080502011022 |
| Decimal Logarithm (log) of 15 | 1.1760912590557 |
Calculation was done in 0.0000038147 seconds
| Sine of 15 | 0.65028784015712 |
| Cosecant of 15 | 1.5377805615409 |
| Cosine of 15 | -0.75968791285882 |
| Secant of 15 | -1.3163300127244 |
| Tangent of 15 | -0.85599340090852 |
| Cotangent of 15 | -1.1682333052318 |
Calculation was done in 0.0000112057 seconds
Is 15 an Odd Number?
Yes, the number 15 is an odd number.
Total number of all odd numbers from 1 to 15 is
8Sum of all the odd numbers from 1 to 15 are
64The sum of all odd numbers is a perfect square: 64 = 8
An odd number is any integer (a whole number) that cannot be divided by 2 evenly. Odd numbers are the opposite of even numbers.Previous odd number is
13
Calculation was done in 0.0000059605 seconds
| The spelling of 15 in words is "fifteen", meaning that: |
| 15 is an aban number (a number without the letter a) |
| 15 is not an eban number (as it contains the letter e) |
| 15 is not an iban number (as it contains the letter i) |
| 15 is an oban number (a number without the letter o) |
| 15 is not a tban number (as it contains the letter t) |
| 15 is an uban number (a number without the letter u) |
Calculation was done in 0.0000028610 seconds
| Bengali numerals | ১৫ |
| Eastern Arabic numerals | ١٥ |
| Hieroglyphs numeralsused in Ancient Egypt | 𓎆𓏾 |
| Khmer numerals | ១៥ |
| Japanese numerals | 十五 |
| Roman numerals | XV |
| Thai numerals | ๑๕ |
Calculation was done in 0.0000760555 seconds
| Arabic | خمسة عشر |
| Croatian | petnaest |
| Czech | patnáct |
| Danish | femten |
| Dutch | vijftien |
| Estonian | wuiatɔ̃ |
| Faroese | fímtan |
| Filipino | labíng-limá |
| Finnish | viisitoista |
| French | quinze |
| Greek | δεκαπέντε |
| German | fünfzehn |
| Hebrew | חמש עשרה |
| Hindi | पन्द्रह |
| Hungarian | tizenöt |
| Icelandic | fimmtán |
| Indonesian | lima belas |
| Italian | quindici |
| Japanese | 十五 |
| Korean | 십오 |
| Latvian | piecpadsmit |
| Lithuanian | penkiolika |
| Norwegian | femten |
| Persian | پانزده |
| Polish | piętnaście |
| Portuguese | quinze |
| Romanian | cincisprezece |
| Russian | пятнадцать |
| Serbian | петнаест |
| Slovak | pätnásť |
| Slovene | petnajst |
| Spanish | quince |
| Swahili | kumi na tano |
| Swedish | femton |
| Thai | สิบห้า |
| Turkish | on beş |
| Ukrainian | пʼятнадцять |
| Vietnamese | mười lăm |
Calculation was done in 0.0195171833 seconds
| Number 15 reversed | 51 |
| ASCII Code | 15 | |
| Unicode Character | U+000F | |
| Unix Timestamp | Thu, 01 Jan 1970 00:00:15 +0000 |
Calculation was done in 0.0000500679 seconds
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