118 (one hundred [and] eighteen) is the natural number following 117 and preceding 119.
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In mathematics
There is no solution to the equation φ(x) = 118, making 118 a nontotient.
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.
Because of its expression as 118 = 35 − 53, it is a Leyland number of the second kind.
118!! - 1 is a prime number, where !! denotes the double factorial (the product of even integers up to 118).
In chemistry
As of 2025, 118 elements have an official name assigned by IUPAC, the last of which (number 118) being oganesson.