18
Number 18 (eighteen) is an even two-digits composite number and natural number following 17 and preceding 19.
| 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 0.0000491142 seconds
| Prime factorization | 2 x 3 x 3 |
| Prime factorization in exponent form | 2 x 32 |
| 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 0.0000109673 seconds
| List of proper divisors | 1, 2, 3, 6, 9 |
| List of all dividers | 1, 2, 3, 6, 9, 18 |
| Number of divisors d(n) | 6 |
| Sum of all divisors σ(n) | 39 |
| Aliquot sum | 21 |
| 18 is an abundant number , because the sum of its proper divisors (21) is greater than itself. Its abundance is 3. |
Calculation was done in 0.0000309944 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 0.0000138283 seconds
| Is 18 a Catalan number? | No |
| Is 18 a Fibonacci number? | No |
| Is 18 a Idoneal number? | Yes: I14 |
Calculation was done in 0.0000038147 seconds
| 18 is not a Happy number |
| 18 is a Humble number |
| 18 is not a Münchhausen number |
| 18 is not a Perfect number |
| 18 is not a Perfect square |
| 18 is not a Palindrome |
Calculation was done in 0.0077497959 seconds
| Base | System | Value |
|---|
| 2 | Binary | 100102 |
| 3 | Ternary | 2003 |
| 4 | Quaternary | 1024 |
| 5 | Quinary | 335 |
| 6 | Senary | 306 |
| 7 | Septenary | 247 |
| 8 | Octal | 228 |
| 9 | Nonary | 209 |
| 10 | Decimal | 18 |
| 12 | Duodecimal | 1612 |
| 16 | Hexadecimal | 1216 |
| 20 | Vigesimal | i20 |
| 36 | Base36 | i36 |
| 60 | Sexagesimal | I60 |
Calculation was done in 0.0000250340 seconds
| Square of 18 (n2) | 324 |
| Cube of 18 (n3) | 5832 |
| Square root of 18 | 4.2426406871193 |
| Natural Logarithm (ln) of 18 | 2.8903717578962 |
| Decimal Logarithm (log) of 18 | 1.2552725051033 |
Calculation was done in 0.0000071526 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 0.0000150204 seconds
Is 18 an Even Number?
Yes, the number 18 is an even number.
Previous even number is
16
Calculation was done in 0.0000059605 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 0.0000040531 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 0.0001170635 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 0.0154871941 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 0.0000269413 seconds
This page was generated in 0.02 seconds.