639234172 has 12 divisors (see below), whose sum is σ = 1122305800. Its totient is φ = 318575376.

The previous prime is 639234161. The next prime is 639234179. The reversal of 639234172 is 271432936.

639234172 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639234179) 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, 259047 + ... + 261502.

Almost surely, 2^639234172 is an apocalyptic number.

It is an amenable number.

639234172 is a deficient number, since it is larger than the sum of its proper divisors (483071628).

639234172 is a wasteful number, since it uses less digits than its factorization.

639234172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 520860 (or 520858 counting only the distinct ones).

The product of its digits is 54432, while the sum is 37.

The square root of 639234172 is about 25283.0807458268. The cubic root of 639234172 is about 861.4300041478.

The spelling of 639234172 in words is "six hundred thirty-nine million, two hundred thirty-four thousand, one hundred seventy-two".