639987174 has 24 divisors (see below), whose sum is σ = 1388977200. Its totient is φ = 212969328.

The previous prime is 639987133. The next prime is 639987181. The reversal of 639987174 is 471789936.

It is a happy number.

639987174 is a `hidden beast` number, since 6 + 399 + 87 + 174 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 639987174.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18897 + ... + 40460.

It is an arithmetic number, because the mean of its divisors is an integer number (57874050).

Almost surely, 2^639987174 is an apocalyptic number.

639987174 is an abundant number, since it is smaller than the sum of its proper divisors (748990026).

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

639987174 is a wasteful number, since it uses less digits than its factorization.

639987174 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59964 (or 59961 counting only the distinct ones).

The product of its digits is 2286144, while the sum is 54.

The square root of 639987174 is about 25297.9677839940. The cubic root of 639987174 is about 861.7681191453.

The spelling of 639987174 in words is "six hundred thirty-nine million, nine hundred eighty-seven thousand, one hundred seventy-four".