138907952 has 20 divisors (see below), whose sum is σ = 284966136. Its totient is φ = 65368320.

The previous prime is 138907949. The next prime is 138907973. The reversal of 138907952 is 259709831.

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, 255074 + ... + 255617.

Almost surely, 2^138907952 is an apocalyptic number.

It is an amenable number.

138907952 is an abundant number, since it is smaller than the sum of its proper divisors (146058184).

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

138907952 is a wasteful number, since it uses less digits than its factorization.

138907952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 510716 (or 510710 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 44.

The square root of 138907952 is about 11785.9217713338. The cubic root of 138907952 is about 517.8957766491.

The spelling of 138907952 in words is "one hundred thirty-eight million, nine hundred seven thousand, nine hundred fifty-two".