639932274 has 24 divisors (see below), whose sum is σ = 1459495440. Its totient is φ = 202083768.

The previous prime is 639932233. The next prime is 639932291. The reversal of 639932274 is 472239936.

639932274 is a `hidden beast` number, since 639 + 9 + 3 + 2 + 2 + 7 + 4 = 666.

It is a super-2 number, since 2×639932274² = 819026630613622152, which contains 22 as substring.

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, 935232 + ... + 935915.

It is an arithmetic number, because the mean of its divisors is an integer number (60812310).

Almost surely, 2^639932274 is an apocalyptic number.

639932274 is an abundant number, since it is smaller than the sum of its proper divisors (819563166).

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

639932274 is a wasteful number, since it uses less digits than its factorization.

639932274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1871174 (or 1871171 counting only the distinct ones).

The product of its digits is 489888, while the sum is 45.

The square root of 639932274 is about 25296.8826933280. The cubic root of 639932274 is about 861.7434767646.

The spelling of 639932274 in words is "six hundred thirty-nine million, nine hundred thirty-two thousand, two hundred seventy-four".