399411329 has 2 divisors, whose sum is σ = 399411330. Its totient is φ = 399411328.

The previous prime is 399411323. The next prime is 399411349. The reversal of 399411329 is 923114993.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 295840000 + 103571329 = 17200^2 + 10177^2 .

It is a cyclic number.

It is not a de Polignac number, because 399411329 - 2¹² = 399407233 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (399411323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199705664 + 199705665.

It is an arithmetic number, because the mean of its divisors is an integer number (199705665).

Almost surely, 2^399411329 is an apocalyptic number.

It is an amenable number.

399411329 is a deficient number, since it is larger than the sum of its proper divisors (1).

399411329 is an equidigital number, since it uses as much as digits as its factorization.

399411329 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 52488, while the sum is 41.

The square root of 399411329 is about 19985.2778064254. The cubic root of 399411329 is about 736.4446751874. Note that the first 3 decimals are identical.

The spelling of 399411329 in words is "three hundred ninety-nine million, four hundred eleven thousand, three hundred twenty-nine".