115991856 has 30 divisors (see below), whose sum is σ = 324616500. Its totient is φ = 38663904.

The previous prime is 115991839. The next prime is 115991857. The reversal of 115991856 is 658199511.

115991856 is a `hidden beast` number, since 1 + 1 + 599 + 1 + 8 + 56 = 666.

It is a super-2 number, since 2×115991856² = 26908221316649472, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (115991857) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 402606 + ... + 402893.

It is an arithmetic number, because the mean of its divisors is an integer number (10820550).

Almost surely, 2^115991856 is an apocalyptic number.

115991856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

115991856 is an abundant number, since it is smaller than the sum of its proper divisors (208624644).

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

115991856 is a wasteful number, since it uses less digits than its factorization.

115991856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 805513 (or 805504 counting only the distinct ones).

The product of its digits is 97200, while the sum is 45.

The square root of 115991856 is about 10769.9515319244. The cubic root of 115991856 is about 487.6884825415.

The spelling of 115991856 in words is "one hundred fifteen million, nine hundred ninety-one thousand, eight hundred fifty-six".