138756904 has 32 divisors (see below), whose sum is σ = 305655840. Its totient is φ = 58219200.

The previous prime is 138756901. The next prime is 138756913. The reversal of 138756904 is 409657831.

It is not an unprimeable number, because it can be changed into a prime (138756901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59502 + ... + 61789.

It is an arithmetic number, because the mean of its divisors is an integer number (9551745).

Almost surely, 2^138756904 is an apocalyptic number.

It is an amenable number.

138756904 is an abundant number, since it is smaller than the sum of its proper divisors (166898936).

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

138756904 is a wasteful number, since it uses less digits than its factorization.

138756904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121321 (or 121317 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 43.

The square root of 138756904 is about 11779.5120442232. The cubic root of 138756904 is about 517.7079892405.

The spelling of 138756904 in words is "one hundred thirty-eight million, seven hundred fifty-six thousand, nine hundred four".