639496319 has 16 divisors (see below), whose sum is σ = 839258880. Its totient is φ = 472080960.

The previous prime is 639496309. The next prime is 639496331. The reversal of 639496319 is 913694936.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-639496319 is a prime.

It is a super-2 number, since 2×639496319² = 817911084029099522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639496309) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 217094 + ... + 220019.

It is an arithmetic number, because the mean of its divisors is an integer number (52453680).

Almost surely, 2^639496319 is an apocalyptic number.

639496319 is a deficient number, since it is larger than the sum of its proper divisors (199762561).

639496319 is a wasteful number, since it uses less digits than its factorization.

639496319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437150.

The product of its digits is 944784, while the sum is 50.

The square root of 639496319 is about 25288.2644521130. The cubic root of 639496319 is about 861.5477442180.

The spelling of 639496319 in words is "six hundred thirty-nine million, four hundred ninety-six thousand, three hundred nineteen".