| Nominal | 81440 |
| Cardinal | eighty-one thousand four hundred forty |
Cardinal eighty-one thousand four hundred forty | |
| Ordinal | 81,440th |
| Number of digits | 5 |
| Sum of digits | 17 |
| Product of digits | 0 |
| Number parity | Even |
| Prime factorization | 2 x 2 x 2 x 2 x 2 x 5 x 509 |
| Prime factorization in exponent form | 25 x 5 x 509 |
| Prime factors | 2, 5, 509 |
| Number of distinct prime factors ω(n) | 3 |
| Total number of prime factors Ω(n) | 7 |
| Sum of prime factors | 516 |
| Product of prime factors | 5090 |
| Is 81440 a prime number? | No |
| Is 81440 a semiprime number? | No |
| Is 81440 a Chen prime number? | No |
| Is 81440 a Mersenne prime number? | No |
| Is 81440 a Catalan number? | No |
| Is 81440 a Fibonacci number? | No |
| Is 81440 a Idoneal number? | No |
| Square of 81440 (n2) | 6632473600 |
| Cube of 81440 (n3) | 540148649984000 |
| Square root of 81440 | 285.37694370779 |
| Natural Logarithm (ln) of 81440 | 11.307621831784 |
| Decimal Logarithm (log) of 81440 | 4.9108377649927 |
| Sine of 81440 | -0.47383532826905 |
| Cosecant of 81440 | -2.1104378258436 |
| Cosine of 81440 | -0.88061346894319 |
| Secant of 81440 | -1.1355720020954 |
| Tangent of 81440 | 0.53807413238602 |
| Cotangent of 81440 | 1.858479974805 |
| The spelling of 81440 in words is "eighty-one thousand four hundred forty", meaning that: |
| 81440 is not an aban number (as it contains the letter a) |
| 81440 is not an eban number (as it contains the letter e) |
| 81440 is not an iban number (as it contains the letter i) |
| 81440 is not an oban number (as it contains the letter o) |
| 81440 is not a tban number (as it contains the letter t) |
| 81440 is not an uban number (as it contains the letter u) |
| Bengali numerals | ৮১৪৪০ |
| Eastern Arabic numerals | ٨١٬٤٤٠ |
| Hieroglyphs numeralsused in Ancient Egypt | 𓂭𓂭𓂭𓂭𓂭𓂭𓂭𓂭𓆼𓍥𓎉 |
| Khmer numerals | ៨១៤៤០ |
| Japanese numerals | 八万千四百四十 |
| Roman numerals | n/a |
| Thai numerals | ๘๑๔๔๐ |
| Arabic | واحد و ثمانون ألف و أربعة مائة و أربعون |
| Croatian | osamdeset i jedna tisuća četiristo četrdeset |
| Czech | osmdesát jedna tisíc čtyři sta čtyřicet |
| Danish | en og firs tusinde fire hundrede fyrre |
| Dutch | éénentachtigduizend vierhonderdveertig |
| Estonian | akpe blaenyi vɔ ɖekɛ alafa ene kple blaene |
| Faroese | áttatieitt tusin og fýrehundraðogfýrati |
| Filipino | walóng pû’t isáng libó’t ápat na daán at ápat na pû |
| Finnish | kahdeksankymmentäyksituhattaneljäsataaneljäkymmentä |
| French | quatre-vingt-un mille quatre cent quarante |
| Greek | ογδόντα μία χίλιάδες τετρακόσια σαράντα |
| German | einundachtzigtausendvierhundertvierzig |
| Hebrew | שמונים ואחד אלף ארבע מאות ארבעים |
| Hindi | इक्यासी हज़ार चार सौ चालीस |
| Hungarian | nyolcvanegyezernégyszáznegyven |
| Icelandic | áttatíu og eitt þúsund og fjögurhundrað og fjörutíu |
| Indonesian | delapan puluh satu ribu empat ratus empat puluh |
| Italian | ottant e unmilaquattrocentoquaranta |
| Japanese | 八万千四百四十 |
| Korean | 팔만 천사백사십 |
| Latvian | astoņdesmit viens tūkstoši četrsimt četrdesmit |
| Lithuanian | aštuoniasdešimt vienas tūkstantis keturi šimtai keturiasdešimt |
| Norwegian | åttiett tusen fire hundre og førti |
| Persian | هشتاد و یک هزار و چهارصد و چهل |
| Polish | osiemdziesiąt jeden tysięcy czterysta czterdzieści |
| Portuguese | oitenta e um mil quatrocentos e quarenta |
| Romanian | optzeci şi una mii patru sute patruzeci |
| Russian | восемьдесят одна тысяча четыреста сорок |
| Serbian | осамдесет и једна хиљада четиристо четрдесет |
| Slovak | osemdesiatjedna tisíc štyristo štyridsať |
| Slovene | osemdeset ena tisuću štiristo štirideset |
| Spanish | ochenta y un mil cuatrocientos cuarenta |
| Swahili | elfu themanini na moja, mia nne na arobaini |
| Swedish | åttioentusenfyrahundrafyrtio |
| Thai | แปดหมื่นหนึ่งพันสี่ร้อยสี่สิบ |
| Turkish | seksen bir bin dört yüz kırk |
| Ukrainian | вісімдесят одна тисяча чотириста сорок |
| Vietnamese | tám mươi mốt nghìn bốn trăm bốn mươi |
| Number 81440 reversed | 04418 | |
| Unicode Character | U+13E20 | |
| Unix Timestamp | Thu, 01 Jan 1970 22:37:20 +0000 | |