118931920 has 20 divisors (see below), whose sum is σ = 276516900. Its totient is φ = 47572736.

The previous prime is 118931909. The next prime is 118931927. The reversal of 118931920 is 29139811.

It can be written as a sum of positive squares in 2 ways, for example, as 67436944 + 51494976 = 8212^2 + 7176^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (118931927) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 743245 + ... + 743404.

It is an arithmetic number, because the mean of its divisors is an integer number (13825845).

Almost surely, 2^118931920 is an apocalyptic number.

118931920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

118931920 is an abundant number, since it is smaller than the sum of its proper divisors (157584980).

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

118931920 is a wasteful number, since it uses less digits than its factorization.

118931920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1486662 (or 1486656 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 34.

The square root of 118931920 is about 10905.5912265223. The cubic root of 118931920 is about 491.7746560969.

The spelling of 118931920 in words is "one hundred eighteen million, nine hundred thirty-one thousand, nine hundred twenty".