399236329 has 2 divisors, whose sum is σ = 399236330. Its totient is φ = 399236328.

The previous prime is 399236297. The next prime is 399236351. The reversal of 399236329 is 923632993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 396925929 + 2310400 = 19923^2 + 1520^2 .

It is a cyclic number.

It is not a de Polignac number, because 399236329 - 2⁵ = 399236297 is a prime.

It is not a weakly prime, because it can be changed into another prime (399236029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199618164 + 199618165.

It is an arithmetic number, because the mean of its divisors is an integer number (199618165).

Almost surely, 2^399236329 is an apocalyptic number.

It is an amenable number.

399236329 is a deficient number, since it is larger than the sum of its proper divisors (1).

399236329 is an equidigital number, since it uses as much as digits as its factorization.

399236329 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 472392, while the sum is 46.

The square root of 399236329 is about 19980.8991038942. The cubic root of 399236329 is about 736.3371030049.

The spelling of 399236329 in words is "three hundred ninety-nine million, two hundred thirty-six thousand, three hundred twenty-nine".