639253146 has 16 divisors (see below), whose sum is σ = 1461150144. Its totient is φ = 182643744.

The previous prime is 639253133. The next prime is 639253169. The reversal of 639253146 is 641352936.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7610115 + ... + 7610198.

It is an arithmetic number, because the mean of its divisors is an integer number (91321884).

Almost surely, 2^639253146 is an apocalyptic number.

639253146 is an abundant number, since it is smaller than the sum of its proper divisors (821896998).

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

639253146 is a wasteful number, since it uses less digits than its factorization.

639253146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15220325.

The product of its digits is 116640, while the sum is 39.

The square root of 639253146 is about 25283.4559742137. The cubic root of 639253146 is about 861.4385271648.

The spelling of 639253146 in words is "six hundred thirty-nine million, two hundred fifty-three thousand, one hundred forty-six".