399363909079 has 2 divisors, whose sum is σ = 399363909080. Its totient is φ = 399363909078.

The previous prime is 399363909047. The next prime is 399363909121. The reversal of 399363909079 is 970909363993.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 399363909079 - 2⁵ = 399363909047 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (399363999079) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199681954539 + 199681954540.

It is an arithmetic number, because the mean of its divisors is an integer number (199681954540).

Almost surely, 2^399363909079 is an apocalyptic number.

399363909079 is a deficient number, since it is larger than the sum of its proper divisors (1).

399363909079 is an equidigital number, since it uses as much as digits as its factorization.

399363909079 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 66961566, while the sum is 67.

The spelling of 399363909079 in words is "three hundred ninety-nine billion, three hundred sixty-three million, nine hundred nine thousand, seventy-nine".