639304479 has 12 divisors (see below), whose sum is σ = 1007389032. Its totient is φ = 387457200.

The previous prime is 639304459. The next prime is 639304483. The reversal of 639304479 is 974403936.

639304479 is a `hidden beast` number, since 639 + 3 + 0 + 4 + 4 + 7 + 9 = 666.

It is not a de Polignac number, because 639304479 - 2¹¹ = 639302431 is a prime.

It is a super-2 number, since 2×639304479² = 817420433738922882, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639304409) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3228712 + ... + 3228909.

It is an arithmetic number, because the mean of its divisors is an integer number (83949086).

Almost surely, 2^639304479 is an apocalyptic number.

639304479 is a deficient number, since it is larger than the sum of its proper divisors (368084553).

639304479 is a wasteful number, since it uses less digits than its factorization.

639304479 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6457638 (or 6457635 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 45.

The square root of 639304479 is about 25284.4711038218. The cubic root of 639304479 is about 861.4615848223.

The spelling of 639304479 in words is "six hundred thirty-nine million, three hundred four thousand, four hundred seventy-nine".