138076979 has 4 divisors (see below), whose sum is σ = 138107976. Its totient is φ = 138045984.

The previous prime is 138076943. The next prime is 138076987. The reversal of 138076979 is 979670831.

138076979 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138076979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138076909) 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, 7409 + ... + 18194.

It is an arithmetic number, because the mean of its divisors is an integer number (34526994).

Almost surely, 2^138076979 is an apocalyptic number.

138076979 is a deficient number, since it is larger than the sum of its proper divisors (30997).

138076979 is an equidigital number, since it uses as much as digits as its factorization.

138076979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30996.

The product of its (nonzero) digits is 571536, while the sum is 50.

The square root of 138076979 is about 11750.6161115067. The cubic root of 138076979 is about 516.8609944460.

The spelling of 138076979 in words is "one hundred thirty-eight million, seventy-six thousand, nine hundred seventy-nine".