138679977 has 8 divisors (see below), whose sum is σ = 184965664. Its totient is φ = 92423808.

The previous prime is 138679967. The next prime is 138680011. The reversal of 138679977 is 779976831.

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

It is not a de Polignac number, because 138679977 - 2⁸ = 138679721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138679907) 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, 8418 + ... + 18660.

It is an arithmetic number, because the mean of its divisors is an integer number (23120708).

Almost surely, 2^138679977 is an apocalyptic number.

It is an amenable number.

138679977 is a deficient number, since it is larger than the sum of its proper divisors (46285687).

138679977 is a wasteful number, since it uses less digits than its factorization.

138679977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14759.

The product of its digits is 4000752, while the sum is 57.

The square root of 138679977 is about 11776.2463034704. The cubic root of 138679977 is about 517.6122989038.

It can be divided in two parts, 138679 and 977, that added together give a triangular number (139656 = T₅₂₈).

The spelling of 138679977 in words is "one hundred thirty-eight million, six hundred seventy-nine thousand, nine hundred seventy-seven".