399822613 has 2 divisors, whose sum is σ = 399822614. Its totient is φ = 399822612.

The previous prime is 399822607. The next prime is 399822649. The reversal of 399822613 is 316228993.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 302168689 + 97653924 = 17383^2 + 9882^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-399822613 is a prime.

It is a super-2 number, since 2×399822613² = 319716243732295538, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 399822613.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (399822013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199911306 + 199911307.

It is an arithmetic number, because the mean of its divisors is an integer number (199911307).

Almost surely, 2^399822613 is an apocalyptic number.

It is an amenable number.

399822613 is a deficient number, since it is larger than the sum of its proper divisors (1).

399822613 is an equidigital number, since it uses as much as digits as its factorization.

399822613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 139968, while the sum is 43.

The square root of 399822613 is about 19995.5648332324. The cubic root of 399822613 is about 736.6973670746.

The spelling of 399822613 in words is "three hundred ninety-nine million, eight hundred twenty-two thousand, six hundred thirteen".