639085122 has 96 divisors (see below), whose sum is σ = 1580932080. Its totient is φ = 185149440.

The previous prime is 639085103. The next prime is 639085133. The reversal of 639085122 is 221580936.

639085122 is a `hidden beast` number, since 639 + 0 + 8 + 5 + 12 + 2 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 57744801 + 581340321 = 7599^2 + 24111^2 .

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 277078 + ... + 279374.

Almost surely, 2^639085122 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 639085122, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (790466040).

639085122 is an abundant number, since it is smaller than the sum of its proper divisors (941846958).

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

639085122 is a wasteful number, since it uses less digits than its factorization.

639085122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2388 (or 2385 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 639085122 is about 25280.1329505998. The cubic root of 639085122 is about 861.3630458361.

The spelling of 639085122 in words is "six hundred thirty-nine million, eighty-five thousand, one hundred twenty-two".