639940482 has 24 divisors (see below), whose sum is σ = 1459514160. Its totient is φ = 202086360.

The previous prime is 639940481. The next prime is 639940487. The reversal of 639940482 is 284049936.

639940482 is a `hidden beast` number, since 639 + 9 + 4 + 0 + 4 + 8 + 2 = 666.

It is not an unprimeable number, because it can be changed into a prime (639940481) 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 11 ways as a sum of consecutive naturals, for example, 935244 + ... + 935927.

It is an arithmetic number, because the mean of its divisors is an integer number (60813090).

Almost surely, 2^639940482 is an apocalyptic number.

639940482 is an abundant number, since it is smaller than the sum of its proper divisors (819573678).

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

639940482 is a wasteful number, since it uses less digits than its factorization.

639940482 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1871198 (or 1871195 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 45.

The square root of 639940482 is about 25297.0449262359. The cubic root of 639940482 is about 861.7471610921.

The spelling of 639940482 in words is "six hundred thirty-nine million, nine hundred forty thousand, four hundred eighty-two".