639108707 has 2 divisors, whose sum is σ = 639108708. Its totient is φ = 639108706.

The previous prime is 639108703. The next prime is 639108713. The reversal of 639108707 is 707801936.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 639108707 - 2² = 639108703 is a prime.

It is not a weakly prime, because it can be changed into another prime (639108703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319554353 + 319554354.

It is an arithmetic number, because the mean of its divisors is an integer number (319554354).

Almost surely, 2^639108707 is an apocalyptic number.

639108707 is a deficient number, since it is larger than the sum of its proper divisors (1).

639108707 is an equidigital number, since it uses as much as digits as its factorization.

639108707 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 63504, while the sum is 41.

The square root of 639108707 is about 25280.5994193176. The cubic root of 639108707 is about 861.3736417108.

The spelling of 639108707 in words is "six hundred thirty-nine million, one hundred eight thousand, seven hundred seven".