639070337 has 2 divisors, whose sum is σ = 639070338. Its totient is φ = 639070336.

The previous prime is 639070331. The next prime is 639070357. The reversal of 639070337 is 733070936.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 384316816 + 254753521 = 19604^2 + 15961^2 .

It is a cyclic number.

It is not a de Polignac number, because 639070337 - 2¹⁶ = 639004801 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 639070337.

It is not a weakly prime, because it can be changed into another prime (639070331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319535168 + 319535169.

It is an arithmetic number, because the mean of its divisors is an integer number (319535169).

Almost surely, 2^639070337 is an apocalyptic number.

It is an amenable number.

639070337 is a deficient number, since it is larger than the sum of its proper divisors (1).

639070337 is an equidigital number, since it uses as much as digits as its factorization.

639070337 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 71442, while the sum is 38.

The square root of 639070337 is about 25279.8405256046. The cubic root of 639070337 is about 861.3564033455.

The spelling of 639070337 in words is "six hundred thirty-nine million, seventy thousand, three hundred thirty-seven".