639311982 has 16 divisors (see below), whose sum is σ = 1294030080. Its totient is φ = 210536312.

The previous prime is 639311971. The next prime is 639311983. The reversal of 639311982 is 289113936.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639311983) by changing a digit.

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, 641382 + ... + 642377.

It is an arithmetic number, because the mean of its divisors is an integer number (80876880).

Almost surely, 2^639311982 is an apocalyptic number.

639311982 is an abundant number, since it is smaller than the sum of its proper divisors (654718098).

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

639311982 is a wasteful number, since it uses less digits than its factorization.

639311982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1283847.

The product of its digits is 69984, while the sum is 42.

The square root of 639311982 is about 25284.6194750880. The cubic root of 639311982 is about 861.4649549020.

The spelling of 639311982 in words is "six hundred thirty-nine million, three hundred eleven thousand, nine hundred eighty-two".