639111912 has 16 divisors (see below), whose sum is σ = 1597779840. Its totient is φ = 213037296.

The previous prime is 639111877. The next prime is 639111983. The reversal of 639111912 is 219111936.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13314808 + ... + 13314855.

It is an arithmetic number, because the mean of its divisors is an integer number (99861240).

Almost surely, 2^639111912 is an apocalyptic number.

It is an amenable number.

639111912 is an abundant number, since it is smaller than the sum of its proper divisors (958667928).

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

639111912 is a wasteful number, since it uses less digits than its factorization.

639111912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26629672 (or 26629668 counting only the distinct ones).

The product of its digits is 2916, while the sum is 33.

The square root of 639111912 is about 25280.6628077667. The cubic root of 639111912 is about 861.3750815795.

The spelling of 639111912 in words is "six hundred thirty-nine million, one hundred eleven thousand, nine hundred twelve".