139392388 has 6 divisors (see below), whose sum is σ = 243936686. Its totient is φ = 69696192.

The previous prime is 139392347. The next prime is 139392389. The reversal of 139392388 is 883293931.

It can be written as a sum of positive squares in only one way, i.e., 137874564 + 1517824 = 11742^2 + 1232^2 .

It is not an unprimeable number, because it can be changed into a prime (139392389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17424045 + ... + 17424052.

Almost surely, 2^139392388 is an apocalyptic number.

It is an amenable number.

139392388 is a deficient number, since it is larger than the sum of its proper divisors (104544298).

139392388 is a wasteful number, since it uses less digits than its factorization.

139392388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34848101 (or 34848099 counting only the distinct ones).

The product of its digits is 279936, while the sum is 46.

The square root of 139392388 is about 11806.4553528991. The cubic root of 139392388 is about 518.4971251569.

The spelling of 139392388 in words is "one hundred thirty-nine million, three hundred ninety-two thousand, three hundred eighty-eight".