139388977 has 24 divisors (see below), whose sum is σ = 176096256. Its totient is φ = 109353888.

The previous prime is 139388941. The next prime is 139388983. The reversal of 139388977 is 779883931.

It is not a de Polignac number, because 139388977 - 2⁷ = 139388849 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139388917) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 80038 + ... + 81760.

It is an arithmetic number, because the mean of its divisors is an integer number (7337344).

Almost surely, 2^139388977 is an apocalyptic number.

It is an amenable number.

139388977 is a deficient number, since it is larger than the sum of its proper divisors (36707279).

139388977 is a wasteful number, since it uses less digits than its factorization.

139388977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1877 (or 1870 counting only the distinct ones).

The product of its digits is 2286144, while the sum is 55.

The square root of 139388977 is about 11806.3108971431. The cubic root of 139388977 is about 518.4928958295.

The spelling of 139388977 in words is "one hundred thirty-nine million, three hundred eighty-eight thousand, nine hundred seventy-seven".