639953207 has 2 divisors, whose sum is σ = 639953208. Its totient is φ = 639953206.

The previous prime is 639953203. The next prime is 639953213. The reversal of 639953207 is 702359936.

639953207 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 639953207 - 2² = 639953203 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (639953201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319976603 + 319976604.

It is an arithmetic number, because the mean of its divisors is an integer number (319976604).

Almost surely, 2^639953207 is an apocalyptic number.

639953207 is a deficient number, since it is larger than the sum of its proper divisors (1).

639953207 is an equidigital number, since it uses as much as digits as its factorization.

639953207 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 306180, while the sum is 44.

The square root of 639953207 is about 25297.2964365760. The cubic root of 639953207 is about 861.7528729045.

The spelling of 639953207 in words is "six hundred thirty-nine million, nine hundred fifty-three thousand, two hundred seven".