639932422 has 8 divisors (see below), whose sum is σ = 962127072. Its totient is φ = 319223400.

The previous prime is 639932417. The next prime is 639932429. The reversal of 639932422 is 224239936.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639932429) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 370329 + ... + 372052.

It is an arithmetic number, because the mean of its divisors is an integer number (120265884).

Almost surely, 2^639932422 is an apocalyptic number.

639932422 is a deficient number, since it is larger than the sum of its proper divisors (322194650).

639932422 is a wasteful number, since it uses less digits than its factorization.

639932422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 742814.

The product of its digits is 139968, while the sum is 40.

The square root of 639932422 is about 25296.8856185895. The cubic root of 639932422 is about 861.7435431977.

The spelling of 639932422 in words is "six hundred thirty-nine million, nine hundred thirty-two thousand, four hundred twenty-two".