138976128 has 64 divisors (see below), whose sum is σ = 410182800. Its totient is φ = 46324224.

The previous prime is 138976111. The next prime is 138976141. The reversal of 138976128 is 821679831.

It is a tau number, because it is divible by the number of its divisors (64).

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, 16651 + ... + 23562.

Almost surely, 2^138976128 is an apocalyptic number.

138976128 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

138976128 is an abundant number, since it is smaller than the sum of its proper divisors (271206672).

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

138976128 is an equidigital number, since it uses as much as digits as its factorization.

138976128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40236 (or 40218 counting only the distinct ones).

The product of its digits is 145152, while the sum is 45.

The square root of 138976128 is about 11788.8136807738. The cubic root of 138976128 is about 517.9804905121.

The spelling of 138976128 in words is "one hundred thirty-eight million, nine hundred seventy-six thousand, one hundred twenty-eight".