639067967 has 2 divisors, whose sum is σ = 639067968. Its totient is φ = 639067966.

The previous prime is 639067963. The next prime is 639067993. The reversal of 639067967 is 769760936.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 639067967 - 2² = 639067963 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 (639067963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319533983 + 319533984.

It is an arithmetic number, because the mean of its divisors is an integer number (319533984).

Almost surely, 2^639067967 is an apocalyptic number.

639067967 is a deficient number, since it is larger than the sum of its proper divisors (1).

639067967 is an equidigital number, since it uses as much as digits as its factorization.

639067967 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2571912, while the sum is 53.

The square root of 639067967 is about 25279.7936502654. The cubic root of 639067967 is about 861.3553385607.

The spelling of 639067967 in words is "six hundred thirty-nine million, sixty-seven thousand, nine hundred sixty-seven".