115399872 has 84 divisors (see below), whose sum is σ = 378039376. Its totient is φ = 32970240.

The previous prime is 115399849. The next prime is 115399877. The reversal of 115399872 is 278993511.

It is a tau number, because it is divible by the number of its divisors (84).

It is not an unprimeable number, because it can be changed into a prime (115399877) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10279 + ... + 18342.

Almost surely, 2^115399872 is an apocalyptic number.

115399872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

115399872 is an abundant number, since it is smaller than the sum of its proper divisors (262639504).

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

115399872 is a wasteful number, since it uses less digits than its factorization.

115399872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28646 (or 28633 counting only the distinct ones).

The product of its digits is 136080, while the sum is 45.

The square root of 115399872 is about 10742.4332439164. The cubic root of 115399872 is about 486.8574002700.

It can be divided in two parts, 1153 and 99872, that added together give a triangular number (101025 = T₄₄₉).

The spelling of 115399872 in words is "one hundred fifteen million, three hundred ninety-nine thousand, eight hundred seventy-two".