139255638 has 8 divisors (see below), whose sum is σ = 278511288. Its totient is φ = 46418544.

The previous prime is 139255609. The next prime is 139255643. The reversal of 139255638 is 836552931.

It is a sphenic number, since it is the product of 3 distinct primes.

139255638 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 139255638.

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, 11604631 + ... + 11604642.

It is an arithmetic number, because the mean of its divisors is an integer number (34813911).

Almost surely, 2^139255638 is an apocalyptic number.

139255638 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

139255638 is a wasteful number, since it uses less digits than its factorization.

139255638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23209278.

The product of its digits is 194400, while the sum is 42.

The square root of 139255638 is about 11800.6626085148. The cubic root of 139255638 is about 518.3275135965.

The spelling of 139255638 in words is "one hundred thirty-nine million, two hundred fifty-five thousand, six hundred thirty-eight".