639839562 has 16 divisors (see below), whose sum is σ = 1279968672. Its totient is φ = 213231600.

The previous prime is 639839539. The next prime is 639839639. The reversal of 639839562 is 265938936.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25812 + ... + 44112.

It is an arithmetic number, because the mean of its divisors is an integer number (79998042).

Almost surely, 2^639839562 is an apocalyptic number.

639839562 is an abundant number, since it is smaller than the sum of its proper divisors (640129110).

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

639839562 is a wasteful number, since it uses less digits than its factorization.

639839562 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24133.

The product of its digits is 2099520, while the sum is 51.

The square root of 639839562 is about 25295.0501482009. The cubic root of 639839562 is about 861.7018589127.

The spelling of 639839562 in words is "six hundred thirty-nine million, eight hundred thirty-nine thousand, five hundred sixty-two".