639301457 has 2 divisors, whose sum is σ = 639301458. Its totient is φ = 639301456.

The previous prime is 639301451. The next prime is 639301477. The reversal of 639301457 is 754103936.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 343323841 + 295977616 = 18529^2 + 17204^2 .

It is a cyclic number.

It is not a de Polignac number, because 639301457 - 2⁶ = 639301393 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 639301457.

It is not a weakly prime, because it can be changed into another prime (639301451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 319650728 + 319650729.

It is an arithmetic number, because the mean of its divisors is an integer number (319650729).

Almost surely, 2^639301457 is an apocalyptic number.

It is an amenable number.

639301457 is a deficient number, since it is larger than the sum of its proper divisors (1).

639301457 is an equidigital number, since it uses as much as digits as its factorization.

639301457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 68040, while the sum is 38.

The square root of 639301457 is about 25284.4113437509. The cubic root of 639301457 is about 861.4602274404.

The spelling of 639301457 in words is "six hundred thirty-nine million, three hundred one thousand, four hundred fifty-seven".