139398939 has 6 divisors (see below), whose sum is σ = 201354036. Its totient is φ = 92932620.

The previous prime is 139398923. The next prime is 139398967. The reversal of 139398939 is 939893931.

139398939 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 139398939 - 2⁴ = 139398923 is a prime.

It is not an unprimeable number, because it can be changed into a prime (139398989) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7744377 + ... + 7744394.

It is an arithmetic number, because the mean of its divisors is an integer number (33559006).

Almost surely, 2^139398939 is an apocalyptic number.

139398939 is a deficient number, since it is larger than the sum of its proper divisors (61955097).

139398939 is a wasteful number, since it uses less digits than its factorization.

139398939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15488777 (or 15488774 counting only the distinct ones).

The product of its digits is 1417176, while the sum is 54.

The square root of 139398939 is about 11806.7327826118. The cubic root of 139398939 is about 518.5052476030.

The spelling of 139398939 in words is "one hundred thirty-nine million, three hundred ninety-eight thousand, nine hundred thirty-nine".