639919134 has 24 divisors (see below), whose sum is σ = 1468050480. Its totient is φ = 200758848.

The previous prime is 639919109. The next prime is 639919141. The reversal of 639919134 is 431919936.

639919134 is a `hidden beast` number, since 639 + 9 + 1 + 9 + 1 + 3 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 639919134.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1045314 + ... + 1045925.

It is an arithmetic number, because the mean of its divisors is an integer number (61168770).

Almost surely, 2^639919134 is an apocalyptic number.

639919134 is an abundant number, since it is smaller than the sum of its proper divisors (828131346).

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

639919134 is a wasteful number, since it uses less digits than its factorization.

639919134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2091264 (or 2091261 counting only the distinct ones).

The product of its digits is 157464, while the sum is 45.

The square root of 639919134 is about 25296.6229761998. The cubic root of 639919134 is about 861.7375785432.

The spelling of 639919134 in words is "six hundred thirty-nine million, nine hundred nineteen thousand, one hundred thirty-four".