639467963 has 2 divisors, whose sum is σ = 639467964. Its totient is φ = 639467962.

The previous prime is 639467957. The next prime is 639467977. The reversal of 639467963 is 369764936.

639467963 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 639467963 - 2²⁰ = 638419387 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (639467923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319733981 + 319733982.

It is an arithmetic number, because the mean of its divisors is an integer number (319733982).

Almost surely, 2^639467963 is an apocalyptic number.

639467963 is a deficient number, since it is larger than the sum of its proper divisors (1).

639467963 is an equidigital number, since it uses as much as digits as its factorization.

639467963 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4408992, while the sum is 53.

The square root of 639467963 is about 25287.7037905777. The cubic root of 639467963 is about 861.5350100249.

The spelling of 639467963 in words is "six hundred thirty-nine million, four hundred sixty-seven thousand, nine hundred sixty-three".