Nominal | 18 |

Cardinal | eighteen |

Ordinal | 18th |

Number of digits | 2 |

Sum of digits | 9 |

Product of digits | 8 |

Number parity | Even |

Calculation was done in 0.0000350475 seconds

Prime factorization | 2 x 3 x 3 |

Prime factorization in exponent form | 2 x 3^{2} |

Prime factors | 2, 3 |

Number of distinct prime factors ω(n) | 2 |

Total number of prime factors Ω(n) | 3 |

Sum of prime factors | 5 |

Product of prime factors | 6 |

Calculation was done in 0.0000090599 seconds

Calculation was done in 0.0000219345 seconds

Is 18 a prime number? | No |

Is 18 a semiprime number? | No |

Is 18 a Chen prime number? | No |

Is 18 a Mersenne prime number? | No |

Calculation was done in 0.0000100136 seconds

Is 18 a Catalan number? | No |

Is 18 a Fibonacci number? | No |

Is 18 a Idoneal number? | Yes: I_{14} |

Calculation was done in 0.0000030994 seconds

Calculation was done in 0.0052220821 seconds

Calculation was done in 0.0000169277 seconds

Calculation was done in 0.0000050068 seconds

Sine of 18 | -0.75098724677168 |

Cosecant of 18 | -1.3315805352205 |

Cosine of 18 | 0.66031670824408 |

Secant of 18 | 1.5144248017882 |

Tangent of 18 | -1.1373137123377 |

Cotangent of 18 | -0.87926487577869 |

Calculation was done in 0.0000100136 seconds

Yes, the number 18 is an even number.

No

Calculation was done in 0.0000028610 seconds

The spelling of 18 in words is "eighteen", meaning that: |

18 is an aban number (a number without the letter a) |

18 is not an eban number (as it contains the letter e) |

18 is not an iban number (as it contains the letter i) |

18 is an oban number (a number without the letter o) |

18 is not a tban number (as it contains the letter t) |

18 is an uban number (a number without the letter u) |

Calculation was done in 0.0000021458 seconds

Bengali numerals | ১৮ |

Eastern Arabic numerals | ١٨ |

Hieroglyphs numeralsused in Ancient Egypt | 𓎆𓐁 |

Khmer numerals | ១៨ |

Japanese numerals | 十八 |

Roman numerals | XVIII |

Thai numerals | ๑๘ |

Calculation was done in 0.0000848770 seconds

Arabic | ثمانية عشر |

Croatian | osamnaest |

Czech | osmnáct |

Danish | atten |

Dutch | achttien |

Estonian | wuienyi |

Faroese | átjan |

Filipino | labíng-waló |

Finnish | kahdeksantoista |

French | dix-huit |

Greek | δεκαοκτώ |

German | achtzehn |

Hebrew | שמונה עשרה |

Hindi | अठारह |

Hungarian | tizennyolc |

Icelandic | átján |

Indonesian | delapan belas |

Italian | diciotto |

Japanese | 十八 |

Korean | 십팔 |

Latvian | astoņpadsmit |

Lithuanian | aštuoniolika |

Norwegian | atten |

Persian | هجده |

Polish | osiemnaście |

Portuguese | dezoito |

Romanian | optsprezece |

Russian | восемнадцать |

Serbian | осамнаест |

Slovak | osemnásť |

Slovene | asemnajst |

Spanish | dieciocho |

Swahili | kumi na nane |

Swedish | arton |

Thai | สิบแปด |

Turkish | on sekiz |

Ukrainian | вісімнадцять |

Vietnamese | mười tám |

Calculation was done in 0.0139188766 seconds

Number 18 reversed | 81 | |

ASCII Code | 18 | |

Unicode Character | U+0012 | |

Unix Timestamp | Thu, 01 Jan 1970 00:00:18 +0000 |

Calculation was done in 0.0000259876 seconds

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