138865977 has 12 divisors (see below), whose sum is σ = 201636864. Its totient is φ = 92091480.

The previous prime is 138865919. The next prime is 138866017. The reversal of 138865977 is 779568831.

138865977 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 138865977 - 2⁷ = 138865849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138865907) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38673 + ... + 42110.

It is an arithmetic number, because the mean of its divisors is an integer number (16803072).

Almost surely, 2^138865977 is an apocalyptic number.

It is an amenable number.

138865977 is a deficient number, since it is larger than the sum of its proper divisors (62770887).

138865977 is a wasteful number, since it uses less digits than its factorization.

138865977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80980 (or 80977 counting only the distinct ones).

The product of its digits is 2540160, while the sum is 54.

The square root of 138865977 is about 11784.1409105628. The cubic root of 138865977 is about 517.8436057332.

The spelling of 138865977 in words is "one hundred thirty-eight million, eight hundred sixty-five thousand, nine hundred seventy-seven".