639946732 has 12 divisors (see below), whose sum is σ = 1120202776. Its totient is φ = 319888800.

The previous prime is 639946711. The next prime is 639946859. The reversal of 639946732 is 237649936.

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, 2238 + ... + 35845.

Almost surely, 2^639946732 is an apocalyptic number.

It is an amenable number.

639946732 is a deficient number, since it is larger than the sum of its proper divisors (480256044).

639946732 is a wasteful number, since it uses less digits than its factorization.

639946732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42288 (or 42286 counting only the distinct ones).

The product of its digits is 1469664, while the sum is 49.

The square root of 639946732 is about 25297.1684581496. The cubic root of 639946732 is about 861.7499665104.

The spelling of 639946732 in words is "six hundred thirty-nine million, nine hundred forty-six thousand, seven hundred thirty-two".