639157307 has 2 divisors, whose sum is σ = 639157308. Its totient is φ = 639157306.

The previous prime is 639157301. The next prime is 639157357. The reversal of 639157307 is 703751936.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 639157307 - 2¹⁰ = 639156283 is a prime.

It is a Chen prime.

It is equal to p_33258929 and since 639157307 and 33258929 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (639157301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319578653 + 319578654.

It is an arithmetic number, because the mean of its divisors is an integer number (319578654).

Almost surely, 2^639157307 is an apocalyptic number.

639157307 is a deficient number, since it is larger than the sum of its proper divisors (1).

639157307 is an equidigital number, since it uses as much as digits as its factorization.

639157307 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 119070, while the sum is 41.

The square root of 639157307 is about 25281.5606124306. The cubic root of 639157307 is about 861.3954750846.

The spelling of 639157307 in words is "six hundred thirty-nine million, one hundred fifty-seven thousand, three hundred seven".