1138931915 has 64 divisors (see below), whose sum is σ = 1690606080. Its totient is φ = 725760000.

The previous prime is 1138931903. The next prime is 1138931921. The reversal of 1138931915 is 5191398311.

It is not a de Polignac number, because 1138931915 - 2⁸ = 1138931659 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1083140 + ... + 1084190.

It is an arithmetic number, because the mean of its divisors is an integer number (26415720).

Almost surely, 2^1138931915 is an apocalyptic number.

1138931915 is a deficient number, since it is larger than the sum of its proper divisors (551674165).

1138931915 is a wasteful number, since it uses less digits than its factorization.

1138931915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1164.

The product of its digits is 29160, while the sum is 41.

The square root of 1138931915 is about 33748.0653519576. The cubic root of 1138931915 is about 1044.3175767782.

The spelling of 1138931915 in words is "one billion, one hundred thirty-eight million, nine hundred thirty-one thousand, nine hundred fifteen".