639965046 has 16 divisors (see below), whose sum is σ = 1462777344. Its totient is φ = 182847144.

The previous prime is 639965009. The next prime is 639965077. The reversal of 639965046 is 640569936.

It is a happy number.

639965046 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 639964986 and 639965004.

It is a congruent number.

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, 7618590 + ... + 7618673.

It is an arithmetic number, because the mean of its divisors is an integer number (91423584).

Almost surely, 2^639965046 is an apocalyptic number.

639965046 is an abundant number, since it is smaller than the sum of its proper divisors (822812298).

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

639965046 is a wasteful number, since it uses less digits than its factorization.

639965046 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15237275.

The product of its (nonzero) digits is 1049760, while the sum is 48.

The square root of 639965046 is about 25297.5304328308. The cubic root of 639965046 is about 861.7581869542.

The spelling of 639965046 in words is "six hundred thirty-nine million, nine hundred sixty-five thousand, forty-six".