115913865 has 16 divisors (see below), whose sum is σ = 186576768. Its totient is φ = 61449216.

The previous prime is 115913843. The next prime is 115913869. The reversal of 115913865 is 568319511.

It is not a de Polignac number, because 115913865 - 2¹⁵ = 115881097 is a prime.

It is not an unprimeable number, because it can be changed into a prime (115913869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20632 + ... + 25641.

It is an arithmetic number, because the mean of its divisors is an integer number (11661048).

Almost surely, 2^115913865 is an apocalyptic number.

115913865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

115913865 is a deficient number, since it is larger than the sum of its proper divisors (70662903).

115913865 is a wasteful number, since it uses less digits than its factorization.

115913865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46448.

The product of its digits is 32400, while the sum is 39.

The square root of 115913865 is about 10766.3301546999. The cubic root of 115913865 is about 487.5791534854.

The spelling of 115913865 in words is "one hundred fifteen million, nine hundred thirteen thousand, eight hundred sixty-five".