399337979 has 2 divisors, whose sum is σ = 399337980. Its totient is φ = 399337978.

The previous prime is 399337931. The next prime is 399337993. The reversal of 399337979 is 979733993.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 399337979 - 2²⁰ = 398289403 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (399337999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199668989 + 199668990.

It is an arithmetic number, because the mean of its divisors is an integer number (199668990).

Almost surely, 2^399337979 is an apocalyptic number.

399337979 is a deficient number, since it is larger than the sum of its proper divisors (1).

399337979 is an equidigital number, since it uses as much as digits as its factorization.

399337979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8680203, while the sum is 59.

The square root of 399337979 is about 19983.4426213303. The cubic root of 399337979 is about 736.3995909012.

The spelling of 399337979 in words is "three hundred ninety-nine million, three hundred thirty-seven thousand, nine hundred seventy-nine".