139391256 has 16 divisors (see below), whose sum is σ = 348478200. Its totient is φ = 46463744.

The previous prime is 139391249. The next prime is 139391269. The reversal of 139391256 is 652193931.

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, 2903961 + ... + 2904008.

Almost surely, 2^139391256 is an apocalyptic number.

It is an amenable number.

139391256 is an abundant number, since it is smaller than the sum of its proper divisors (209086944).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

139391256 is a wasteful number, since it uses less digits than its factorization.

139391256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5807978 (or 5807974 counting only the distinct ones).

The product of its digits is 43740, while the sum is 39.

The square root of 139391256 is about 11806.4074129263. The cubic root of 139391256 is about 518.4957215883.

The spelling of 139391256 in words is "one hundred thirty-nine million, three hundred ninety-one thousand, two hundred fifty-six".