399638513 has 2 divisors, whose sum is σ = 399638514. Its totient is φ = 399638512.

The previous prime is 399638489. The next prime is 399638537. The reversal of 399638513 is 315836993.

It is a balanced prime because it is at equal distance from previous prime (399638489) and next prime (399638537).

It can be written as a sum of positive squares in only one way, i.e., 394101904 + 5536609 = 19852^2 + 2353^2 .

It is an emirp because it is prime and its reverse (315836993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 399638513 - 2⁸ = 399638257 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 (399238513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199819256 + 199819257.

It is an arithmetic number, because the mean of its divisors is an integer number (199819257).

Almost surely, 2^399638513 is an apocalyptic number.

It is an amenable number.

399638513 is a deficient number, since it is larger than the sum of its proper divisors (1).

399638513 is an equidigital number, since it uses as much as digits as its factorization.

399638513 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 524880, while the sum is 47.

The square root of 399638513 is about 19990.9607823136. The cubic root of 399638513 is about 736.5842779172.

The spelling of 399638513 in words is "three hundred ninety-nine million, six hundred thirty-eight thousand, five hundred thirteen".