138860979 has 8 divisors (see below), whose sum is σ = 185227200. Its totient is φ = 92534376.

The previous prime is 138860977. The next prime is 138860993. The reversal of 138860979 is 979068831.

138860979 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 138860979 - 2¹ = 138860977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138860971) 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, 429 + ... + 16670.

It is an arithmetic number, because the mean of its divisors is an integer number (23153400).

Almost surely, 2^138860979 is an apocalyptic number.

138860979 is a deficient number, since it is larger than the sum of its proper divisors (46366221).

138860979 is a wasteful number, since it uses less digits than its factorization.

138860979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19809.

The product of its (nonzero) digits is 653184, while the sum is 51.

The square root of 138860979 is about 11783.9288439807. The cubic root of 138860979 is about 517.8373929962.

The spelling of 138860979 in words is "one hundred thirty-eight million, eight hundred sixty thousand, nine hundred seventy-nine".