399015329 has 2 divisors, whose sum is σ = 399015330. Its totient is φ = 399015328.

The previous prime is 399015307. The next prime is 399015349. The reversal of 399015329 is 923510993.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 208022929 + 190992400 = 14423^2 + 13820^2 .

It is an emirp because it is prime and its reverse (923510993) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-399015329 is a prime.

It is not a weakly prime, because it can be changed into another prime (399015349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199507664 + 199507665.

It is an arithmetic number, because the mean of its divisors is an integer number (199507665).

Almost surely, 2^399015329 is an apocalyptic number.

It is an amenable number.

399015329 is a deficient number, since it is larger than the sum of its proper divisors (1).

399015329 is an equidigital number, since it uses as much as digits as its factorization.

399015329 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 65610, while the sum is 41.

The square root of 399015329 is about 19975.3680566842. The cubic root of 399015329 is about 736.2012097807.

The spelling of 399015329 in words is "three hundred ninety-nine million, fifteen thousand, three hundred twenty-nine".