138739956 has 36 divisors (see below), whose sum is σ = 338278752. Its totient is φ = 44173536.

The previous prime is 138739949. The next prime is 138739967. The reversal of 138739956 is 659937831.

It is a junction number, because it is equal to n+sod(n) for n = 138739899 and 138739908.

It is a congruent number.

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, 195330 + ... + 196038.

It is an arithmetic number, because the mean of its divisors is an integer number (9396632).

Almost surely, 2^138739956 is an apocalyptic number.

It is an amenable number.

138739956 is an abundant number, since it is smaller than the sum of its proper divisors (199538796).

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

138739956 is an equidigital number, since it uses as much as digits as its factorization.

138739956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1448 (or 737 counting only the distinct ones).

The product of its digits is 1224720, while the sum is 51.

The square root of 138739956 is about 11778.7926376178. The cubic root of 138739956 is about 517.6869104761.

The spelling of 138739956 in words is "one hundred thirty-eight million, seven hundred thirty-nine thousand, nine hundred fifty-six".