639850122 has 12 divisors (see below), whose sum is σ = 1386341970. Its totient is φ = 213283368.

The previous prime is 639850117. The next prime is 639850129. The reversal of 639850122 is 221058936.

639850122 is a `hidden beast` number, since 63 + 98 + 501 + 2 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 499924881 + 139925241 = 22359^2 + 11829^2 .

It is not an unprimeable number, because it can be changed into a prime (639850129) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 17773597 + ... + 17773632.

Almost surely, 2^639850122 is an apocalyptic number.

639850122 is an abundant number, since it is smaller than the sum of its proper divisors (746491848).

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

639850122 is a wasteful number, since it uses less digits than its factorization.

639850122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35547237 (or 35547234 counting only the distinct ones).

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

The square root of 639850122 is about 25295.2588838304. The cubic root of 639850122 is about 861.7065994353.

It can be divided in two parts, 6 and 39850122, that added together give a triangular number (39850128 = T₈₉₂₇).

The spelling of 639850122 in words is "six hundred thirty-nine million, eight hundred fifty thousand, one hundred twenty-two".