399619079 has 2 divisors, whose sum is σ = 399619080. Its totient is φ = 399619078.

The previous prime is 399619069. The next prime is 399619127. The reversal of 399619079 is 970916993.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 399619079 - 2²⁴ = 382841863 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 399619079.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (399619049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199809539 + 199809540.

It is an arithmetic number, because the mean of its divisors is an integer number (199809540).

Almost surely, 2^399619079 is an apocalyptic number.

399619079 is a deficient number, since it is larger than the sum of its proper divisors (1).

399619079 is an equidigital number, since it uses as much as digits as its factorization.

399619079 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 826686, while the sum is 53.

The square root of 399619079 is about 19990.4747067197. The cubic root of 399619079 is about 736.5723379511.

The spelling of 399619079 in words is "three hundred ninety-nine million, six hundred nineteen thousand, seventy-nine".