139507644 has 24 divisors (see below), whose sum is σ = 344666448. Its totient is φ = 43767040.

The previous prime is 139507639. The next prime is 139507651. The reversal of 139507644 is 446705931.

139507644 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 341727 + ... + 342134.

It is an arithmetic number, because the mean of its divisors is an integer number (14361102).

Almost surely, 2^139507644 is an apocalyptic number.

It is an amenable number.

139507644 is an abundant number, since it is smaller than the sum of its proper divisors (205158804).

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

139507644 is a wasteful number, since it uses less digits than its factorization.

139507644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 683885 (or 683883 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 39.

The square root of 139507644 is about 11811.3354029085. The cubic root of 139507644 is about 518.6399914983.

The spelling of 139507644 in words is "one hundred thirty-nine million, five hundred seven thousand, six hundred forty-four".