115138865 has 16 divisors (see below), whose sum is σ = 141961680. Its totient is φ = 89594880.

The previous prime is 115138853. The next prime is 115138873. The reversal of 115138865 is 568831511.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 3984016 + 111154849 = 1996^2 + 10543^2 .

It is not a de Polignac number, because 115138865 - 2¹⁸ = 114876721 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 93071 + ... + 94299.

It is an arithmetic number, because the mean of its divisors is an integer number (8872605).

Almost surely, 2^115138865 is an apocalyptic number.

It is an amenable number.

115138865 is a deficient number, since it is larger than the sum of its proper divisors (26822815).

115138865 is a wasteful number, since it uses less digits than its factorization.

115138865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1732.

The product of its digits is 28800, while the sum is 38.

The square root of 115138865 is about 10730.2779553933. The cubic root of 115138865 is about 486.4900714018.

The spelling of 115138865 in words is "one hundred fifteen million, one hundred thirty-eight thousand, eight hundred sixty-five".