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**118** (**one hundred [and] eighteen**) is the natural number following 117 and preceding 119.

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Cardinal | one hundred eighteen | |||

Ordinal | 118th (one hundred eighteenth) | |||

Factorization | 2 × 59 | |||

Divisors | 1, 2, 59, 118 | |||

Greek numeral | ΡΙΗ´ | |||

Roman numeral | CXVIII | |||

Binary | 1110110_{2} | |||

Ternary | 11101_{3} | |||

Octal | 166_{8} | |||

Duodecimal | 9A_{12} | |||

Hexadecimal | 76_{16} |

There is no answer to the equation φ(*x*) = 118, making 118 a nontotient.

118 is the smallest *n* such that the range *n*, *n* + 1, ... 4*n*/3 contains at least one prime from each of these forms: 4*x* + 1, 4*x* - 1, 6*x* + 1 and 6*x* - 1.

Four expressions for 118 as the sum of three positive integers have the same product:

- 14 + 50 + 54 = 15 + 40 + 63 = 18 + 30 + 70 = 21 + 25 + 72 = 118 and
- 14 × 50 × 54 = 15 × 40 × 63 = 18 × 30 × 70 = 21 × 25 × 72 = 37800.

118 is the smallest number that can be expressed as four sums with the same product in this way.^{[1]}

118 is a Leyland number of the second kind.

118!! - 1 is prime^{[2]}

- The beginning of directory enquiries numbers in the United Kingdom,
^{[3]}France, Germany, Greece, Latvia, Sweden, Ireland, Iran and Turkey - The emergency at sea emergency telephone number in Japan
- The fire emergency telephone number in Switzerland and Maldives
- The medical emergency telephone number in Bolivia and Indonesia
- The emergency medical services in Italy

**One hundred and eighteen** is also:

- Oganesson, an element with atomic number 118
*118*, a 255-episode Singaporean television drama airing from 2014 to 2015- The number of elements in the Periodic Table.
- The 118th Tactical Fighter Squadron "Mobius", a fictional fighter squadron in
*Ace Combat 04: Shattered Skies*

- 1/18 can also represent the day January 18. The 118th day of the year is April 28, on regular years. On leap years it is April 27.

Wikimedia Commons has media related to 118 (number).

**^**Wells, D.*The Penguin Dictionary of Curious and Interesting Numbers*London: Penguin Group. (1987): 134 - 135**^**Sloane, N. J. A. (ed.). "Sequence A007749 (Numbers k such that k!! - 1 is prime)".*The On-Line Encyclopedia of Integer Sequences*. OEIS Foundation. Retrieved 2022-05-24.**^**List of UK 118 directory enquiry services