138972356 has 12 divisors (see below), whose sum is σ = 244128192. Its totient is φ = 69221448.

The previous prime is 138972341. The next prime is 138972359. The reversal of 138972356 is 653279831.

It is not an unprimeable number, because it can be changed into a prime (138972359) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65000 + ... + 67103.

It is an arithmetic number, because the mean of its divisors is an integer number (20344016).

Almost surely, 2^138972356 is an apocalyptic number.

It is an amenable number.

138972356 is a deficient number, since it is larger than the sum of its proper divisors (105155836).

138972356 is a wasteful number, since it uses less digits than its factorization.

138972356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132370 (or 132368 counting only the distinct ones).

The product of its digits is 272160, while the sum is 44.

The square root of 138972356 is about 11788.6536975178. The cubic root of 138972356 is about 517.9758042395.

The spelling of 138972356 in words is "one hundred thirty-eight million, nine hundred seventy-two thousand, three hundred fifty-six".