138907872 has 60 divisors (see below), whose sum is σ = 408531816. Its totient is φ = 46301760.

The previous prime is 138907823. The next prime is 138907891. The reversal of 138907872 is 278709831.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 24204 + ... + 29387.

Almost surely, 2^138907872 is an apocalyptic number.

138907872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

138907872 is an abundant number, since it is smaller than the sum of its proper divisors (269623944).

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

138907872 is an equidigital number, since it uses as much as digits as its factorization.

138907872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53613 (or 53596 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 45.

The square root of 138907872 is about 11785.9183774537. The cubic root of 138907872 is about 517.8956772268.

The spelling of 138907872 in words is "one hundred thirty-eight million, nine hundred seven thousand, eight hundred seventy-two".