639346982 has 16 divisors (see below), whose sum is σ = 1025907120. Its totient is φ = 297765888.

The previous prime is 639346957. The next prime is 639346993. The reversal of 639346982 is 289643936.

It is a self number, because there is not a number n which added to its sum of digits gives 639346982.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 93632 + ... + 100227.

It is an arithmetic number, because the mean of its divisors is an integer number (64119195).

Almost surely, 2^639346982 is an apocalyptic number.

639346982 is a deficient number, since it is larger than the sum of its proper divisors (386560138).

639346982 is a wasteful number, since it uses less digits than its factorization.

639346982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 193975.

The product of its digits is 1679616, while the sum is 50.

The square root of 639346982 is about 25285.3115859781. The cubic root of 639346982 is about 861.4806753035.

The spelling of 639346982 in words is "six hundred thirty-nine million, three hundred forty-six thousand, nine hundred eighty-two".