52139904 has 32 divisors (see below), whose sum is σ = 138497640. Its totient is φ = 17379840.

The previous prime is 52139897. The next prime is 52139909. The reversal of 52139904 is 40993125.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52139909) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67507 + ... + 68274.

Almost surely, 2^52139904 is an apocalyptic number.

It is an amenable number.

52139904 is an abundant number, since it is smaller than the sum of its proper divisors (86357736).

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

52139904 is a wasteful number, since it uses less digits than its factorization.

52139904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135798 (or 135786 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 33.

The square root of 52139904 is about 7220.7966319514. The cubic root of 52139904 is about 373.5855551856.

The spelling of 52139904 in words is "fifty-two million, one hundred thirty-nine thousand, nine hundred four".