138878904 has 32 divisors (see below), whose sum is σ = 365472000. Its totient is φ = 43856352.

The previous prime is 138878897. The next prime is 138878959. The reversal of 138878904 is 409878831.

138878904 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 151824 + ... + 152735.

It is an arithmetic number, because the mean of its divisors is an integer number (11421000).

Almost surely, 2^138878904 is an apocalyptic number.

It is an amenable number.

138878904 is an abundant number, since it is smaller than the sum of its proper divisors (226593096).

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

138878904 is a wasteful number, since it uses less digits than its factorization.

138878904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304587 (or 304583 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 48.

The square root of 138878904 is about 11784.6893892033. The cubic root of 138878904 is about 517.8596738797.

It can be divided in two parts, 13887 and 8904, that added together give a triangular number (22791 = T₂₁₃).

The spelling of 138878904 in words is "one hundred thirty-eight million, eight hundred seventy-eight thousand, nine hundred four".