639538892 has 12 divisors (see below), whose sum is σ = 1123355520. Its totient is φ = 318580176.

The previous prime is 639538883. The next prime is 639538931. The reversal of 639538892 is 298835936.

639538892 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×639538892³ (a number of 27 digits) contains 333 as substring.

It is a hoax number, since the sum of its digits (53) coincides with the sum of the digits of its distinct prime factors.

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, 296108 + ... + 298259.

It is an arithmetic number, because the mean of its divisors is an integer number (93612960).

Almost surely, 2^639538892 is an apocalyptic number.

It is an amenable number.

639538892 is a deficient number, since it is larger than the sum of its proper divisors (483816628).

639538892 is a wasteful number, since it uses less digits than its factorization.

639538892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 594640 (or 594638 counting only the distinct ones).

The product of its digits is 2799360, while the sum is 53.

The square root of 639538892 is about 25289.1061921927. The cubic root of 639538892 is about 861.5668623152.

The spelling of 639538892 in words is "six hundred thirty-nine million, five hundred thirty-eight thousand, eight hundred ninety-two".