138915936 has 36 divisors (see below), whose sum is σ = 395043012. Its totient is φ = 46305216.

The previous prime is 138915901. The next prime is 138915941. The reversal of 138915936 is 639519831.

It is a tau number, because it is divible by the number of its divisors (36).

It is a junction number, because it is equal to n+sod(n) for n = 138915891 and 138915900.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 240886 + ... + 241461.

It is an arithmetic number, because the mean of its divisors is an integer number (10973417).

Almost surely, 2^138915936 is an apocalyptic number.

138915936 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

138915936 is an abundant number, since it is smaller than the sum of its proper divisors (256127076).

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

138915936 is a wasteful number, since it uses less digits than its factorization.

138915936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 482363 (or 482352 counting only the distinct ones).

The product of its digits is 174960, while the sum is 45.

The square root of 138915936 is about 11786.2604756555. The cubic root of 138915936 is about 517.9056988089.

The spelling of 138915936 in words is "one hundred thirty-eight million, nine hundred fifteen thousand, nine hundred thirty-six".