138939508 has 12 divisors (see below), whose sum is σ = 246773632. Its totient is φ = 68432760.

The previous prime is 138939497. The next prime is 138939511. The reversal of 138939508 is 805939831.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 258948 + ... + 259483.

Almost surely, 2^138939508 is an apocalyptic number.

It is an amenable number.

138939508 is a deficient number, since it is larger than the sum of its proper divisors (107834124).

138939508 is a wasteful number, since it uses less digits than its factorization.

138939508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518502 (or 518500 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 46.

The square root of 138939508 is about 11787.2604111388. The cubic root of 138939508 is about 517.9349908230.

The spelling of 138939508 in words is "one hundred thirty-eight million, nine hundred thirty-nine thousand, five hundred eight".