639372863 has 2 divisors, whose sum is σ = 639372864. Its totient is φ = 639372862.

The previous prime is 639372859. The next prime is 639372869. The reversal of 639372863 is 368273936.

639372863 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 639372863 - 2² = 639372859 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (639372869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319686431 + 319686432.

It is an arithmetic number, because the mean of its divisors is an integer number (319686432).

Almost surely, 2^639372863 is an apocalyptic number.

639372863 is a deficient number, since it is larger than the sum of its proper divisors (1).

639372863 is an equidigital number, since it uses as much as digits as its factorization.

639372863 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 979776, while the sum is 47.

The square root of 639372863 is about 25285.8233601360. The cubic root of 639372863 is about 861.4922994978.

The spelling of 639372863 in words is "six hundred thirty-nine million, three hundred seventy-two thousand, eight hundred sixty-three".