| Nominal | 18381 |
| Cardinal | eighteen thousand three hundred eighty-one |
Cardinal eighteen thousand three hundred eighty-one | |
| Ordinal | 18,381st |
| Number of digits | 5 |
| Sum of digits | 21 |
| Product of digits | 192 |
| Number parity | Odd |
| Prime factorization | 3 x 11 x 557 |
| Prime factors | 3, 11, 557 |
| Number of distinct prime factors ω(n) | 3 |
| Total number of prime factors Ω(n) | 3 |
| Sum of prime factors | 571 |
| Product of prime factors | 18381 |
| Is 18381 a prime number? | No |
| Is 18381 a semiprime number? | No |
| Is 18381 a Chen prime number? | No |
| Is 18381 a Mersenne prime number? | No |
| Is 18381 a Catalan number? | No |
| Is 18381 a Fibonacci number? | No |
| Is 18381 a Idoneal number? | No |
| Square of 18381 (n2) | 337861161 |
| Cube of 18381 (n3) | 6210226000341 |
| Square root of 18381 | 135.57654664432 |
| Natural Logarithm (ln) of 18381 | 9.8190728013938 |
| Decimal Logarithm (log) of 18381 | 4.2643691350516 |
| Sine of 18381 | 0.44270768350257 |
| Cosecant of 18381 | 2.2588268450376 |
| Cosine of 18381 | -0.89666599521103 |
| Secant of 18381 | -1.1152424708206 |
| Tangent of 18381 | -0.49372641080068 |
| Cotangent of 18381 | -2.025413221015 |
| The spelling of 18381 in words is "eighteen thousand three hundred eighty-one", meaning that: |
| 18381 is not an aban number (as it contains the letter a) |
| 18381 is not an eban number (as it contains the letter e) |
| 18381 is not an iban number (as it contains the letter i) |
| 18381 is not an oban number (as it contains the letter o) |
| 18381 is not a tban number (as it contains the letter t) |
| 18381 is not an uban number (as it contains the letter u) |
| Bengali numerals | ১৮৩৮১ |
| Eastern Arabic numerals | ١٨٬٣٨١ |
| Hieroglyphs numeralsused in Ancient Egypt | 𓂭𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓆼𓍤𓎍𓏺 |
| Khmer numerals | ១៨៣៨១ |
| Japanese numerals | 一万八千三百八十一 |
| Roman numerals | n/a |
| Thai numerals | ๑๘๓๘๑ |
| Arabic | ثمانية عشر ألف و ثلاثة مائة و واحد و ثمانون |
| Croatian | osamnaest tisuća tristo osamdeset i jedan |
| Czech | osmnáct tisíc tři sta osmdesát jeden |
| Danish | atten tusinde tre hundrede en og firs |
| Dutch | achttienduizend driehonderdéénentachtig |
| Estonian | akpe wuienyi alafa etɔ̃ blaenyi vɔ ɖekɛ |
| Faroese | átjan tusin og trýhundraðogáttatiein |
| Filipino | labíng-walóng libó’t tatlóng daán at walóng pû’t isá |
| Finnish | kahdeksantoistatuhattakolmesataakahdeksankymmentäyksi |
| French | dix-huit mille trois cent quatre-vingt-un |
| Greek | δεκαοκτώ χίλιάδες τριακόσια ογδόντα ένα |
| German | achtzehntausenddreihunderteinundachtzig |
| Hebrew | שמונה עשר אלף שלוש מאות שמונים ואחת |
| Hindi | अठारह हज़ार तीन सौ इक्यासी |
| Hungarian | tizennyolcezerháromszáznyolcvanegy |
| Icelandic | átján þúsund og þrjúhundrað og áttatíu og einn |
| Indonesian | delapan belas ribu tiga ratus delapan puluh satu |
| Italian | diciottomilatrecentoottantuno |
| Japanese | 一万八千三百八十一 |
| Korean | 만 팔천삼백팔십일 |
| Latvian | astoņpadsmit tūkstoši trīssimt astoņdesmit viens |
| Lithuanian | aštuoniolika tūkstančių trys šimtai aštuoniasdešimt vienas |
| Norwegian | atten tusen tre hundre og åttién |
| Persian | هجده هزار و سیصد و هشتاد و یک |
| Polish | osiemnaście tysięcy trzysta osiemdziesiąt jeden |
| Portuguese | dezoito mil trezentos e oitenta e um |
| Romanian | optsprezece mii trei sute optzeci şi unu |
| Russian | восемнадцать тысяч триста восемьдесят один |
| Serbian | осамнаест хиљада триста осамдесет и један |
| Slovak | osemnásť tisíc tristo osemdesiatjeden |
| Slovene | asemnajst tisuću tristo osemdeset ena |
| Spanish | dieciocho mil trescientos ochenta y uno |
| Swahili | elfu kumi na nane, mia tatu na themanini na moja |
| Swedish | artontusentrehundraåttioen |
| Thai | หนึ่งหมื่นแปดพันสามร้อยแปดสิบเอ็ด |
| Turkish | on sekiz bin üç yüz seksen bir |
| Ukrainian | вісімнадцять тисяч триста вісімдесят один |
| Vietnamese | mười tám nghìn ba trăm tám mươi mốt |
| Number 18381 reversed | 18381 | |
| Unicode Character | U+47CD | 䟍 |
| Unix Timestamp | Thu, 01 Jan 1970 05:06:21 +0000 | |