399102079 has 2 divisors, whose sum is σ = 399102080. Its totient is φ = 399102078.

The previous prime is 399102073. The next prime is 399102113. The reversal of 399102079 is 970201993.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 399102079 - 2³ = 399102071 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (399102071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199551039 + 199551040.

It is an arithmetic number, because the mean of its divisors is an integer number (199551040).

Almost surely, 2^399102079 is an apocalyptic number.

399102079 is a deficient number, since it is larger than the sum of its proper divisors (1).

399102079 is an equidigital number, since it uses as much as digits as its factorization.

399102079 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 30618, while the sum is 40.

The square root of 399102079 is about 19977.5393629946. The cubic root of 399102079 is about 736.2545584640.

The spelling of 399102079 in words is "three hundred ninety-nine million, one hundred two thousand, seventy-nine".