639057396 has 24 divisors (see below), whose sum is σ = 1502878720. Its totient is φ = 211341312.

The previous prime is 639057389. The next prime is 639057407. The reversal of 639057396 is 693750936.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 208141 + ... + 211188.

Almost surely, 2^639057396 is an apocalyptic number.

It is an amenable number.

639057396 is an abundant number, since it is smaller than the sum of its proper divisors (863821324).

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

639057396 is a wasteful number, since it uses less digits than its factorization.

639057396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 419463 (or 419461 counting only the distinct ones).

The product of its (nonzero) digits is 918540, while the sum is 48.

The square root of 639057396 is about 25279.5845693714. The cubic root of 639057396 is about 861.3505892288.

The spelling of 639057396 in words is "six hundred thirty-nine million, fifty-seven thousand, three hundred ninety-six".