139391992 has 16 divisors (see below), whose sum is σ = 261770040. Its totient is φ = 69586656.

The previous prime is 139391981. The next prime is 139392013. The reversal of 139391992 is 299193931.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8118 + ... + 18565.

Almost surely, 2^139391992 is an apocalyptic number.

It is an amenable number.

139391992 is a deficient number, since it is larger than the sum of its proper divisors (122378048).

139391992 is a wasteful number, since it uses less digits than its factorization.

139391992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27342 (or 27338 counting only the distinct ones).

The product of its digits is 118098, while the sum is 46.

The square root of 139391992 is about 11806.4385824007. The cubic root of 139391992 is about 518.4966341567.

It can be divided in two parts, 13939 and 1992, that added together give a triangular number (15931 = T₁₇₈).

The spelling of 139391992 in words is "one hundred thirty-nine million, three hundred ninety-one thousand, nine hundred ninety-two".