138915634 has 24 divisors (see below), whose sum is σ = 246154032. Its totient is φ = 58284720.

The previous prime is 138915617. The next prime is 138915697. The reversal of 138915634 is 436519831.

138915634 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14964 + ... + 22399.

It is an arithmetic number, because the mean of its divisors is an integer number (10256418).

Almost surely, 2^138915634 is an apocalyptic number.

138915634 is a deficient number, since it is larger than the sum of its proper divisors (107238398).

138915634 is a wasteful number, since it uses less digits than its factorization.

138915634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37402 (or 37389 counting only the distinct ones).

The product of its digits is 77760, while the sum is 40.

The square root of 138915634 is about 11786.2476641211. The cubic root of 138915634 is about 517.9053235036.

The spelling of 138915634 in words is "one hundred thirty-eight million, nine hundred fifteen thousand, six hundred thirty-four".