118731618 has 24 divisors (see below), whose sum is σ = 258191388. Its totient is φ = 39432672.

The previous prime is 118731593. The next prime is 118731649. The reversal of 118731618 is 816137811.

It is a happy number.

118731618 is a `hidden beast` number, since 1 + 1 + 8 + 7 + 31 + 618 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 115283169 + 3448449 = 10737^2 + 1857^2 .

It is a super-2 number, since 2×118731618² = 28194394225795848, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6921 + ... + 16892.

Almost surely, 2^118731618 is an apocalyptic number.

118731618 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

118731618 is an abundant number, since it is smaller than the sum of its proper divisors (139459770).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

118731618 is a wasteful number, since it uses less digits than its factorization.

118731618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24098 (or 24095 counting only the distinct ones).

The product of its digits is 8064, while the sum is 36.

The square root of 118731618 is about 10896.4039022055. The cubic root of 118731618 is about 491.4984229995.

The spelling of 118731618 in words is "one hundred eighteen million, seven hundred thirty-one thousand, six hundred eighteen".