138980256 has 24 divisors (see below), whose sum is σ = 364823424. Its totient is φ = 46326720.

The previous prime is 138980243. The next prime is 138980273. The reversal of 138980256 is 652089831.

It is a tau number, because it is divible by the number of its divisors (24).

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, 723760 + ... + 723951.

It is an arithmetic number, because the mean of its divisors is an integer number (15200976).

Almost surely, 2^138980256 is an apocalyptic number.

138980256 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

138980256 is an abundant number, since it is smaller than the sum of its proper divisors (225843168).

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

138980256 is a wasteful number, since it uses less digits than its factorization.

138980256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1447724 (or 1447716 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 42.

The square root of 138980256 is about 11788.9887607038. The cubic root of 138980256 is about 517.9856189763.

The spelling of 138980256 in words is "one hundred thirty-eight million, nine hundred eighty thousand, two hundred fifty-six".