399336331 has 2 divisors, whose sum is σ = 399336332. Its totient is φ = 399336330.

The previous prime is 399336271. The next prime is 399336337. The reversal of 399336331 is 133633993.

It is a strong prime.

It is an emirp because it is prime and its reverse (133633993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 399336331 - 2¹¹ = 399334283 is a prime.

It is a super-2 number, since 2×399336331² = 318939010513083122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (399336337) 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, 199668165 + 199668166.

It is an arithmetic number, because the mean of its divisors is an integer number (199668166).

Almost surely, 2^399336331 is an apocalyptic number.

399336331 is a deficient number, since it is larger than the sum of its proper divisors (1).

399336331 is an equidigital number, since it uses as much as digits as its factorization.

399336331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 118098, while the sum is 40.

The square root of 399336331 is about 19983.4013871513. The cubic root of 399336331 is about 736.3985779011.

It can be divided in two parts, 39933 and 6331, that added together give a palindrome (46264).

The spelling of 399336331 in words is "three hundred ninety-nine million, three hundred thirty-six thousand, three hundred thirty-one".