399359431 has 2 divisors, whose sum is σ = 399359432. Its totient is φ = 399359430.

The previous prime is 399359407. The next prime is 399359473. The reversal of 399359431 is 134953993.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 399359431 - 2¹⁷ = 399228359 is a prime.

It is a super-2 number, since 2×399359431² = 318975910257287522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (399059431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199679715 + 199679716.

It is an arithmetic number, because the mean of its divisors is an integer number (199679716).

Almost surely, 2^399359431 is an apocalyptic number.

399359431 is a deficient number, since it is larger than the sum of its proper divisors (1).

399359431 is an equidigital number, since it uses as much as digits as its factorization.

399359431 is an evil number, because the sum of its binary digits is even.

The product of its digits is 393660, while the sum is 46.

The square root of 399359431 is about 19983.9793584761. The cubic root of 399359431 is about 736.4127768590.

The spelling of 399359431 in words is "three hundred ninety-nine million, three hundred fifty-nine thousand, four hundred thirty-one".