399709863899 has 2 divisors, whose sum is σ = 399709863900. Its totient is φ = 399709863898.

The previous prime is 399709863881. The next prime is 399709863907. The reversal of 399709863899 is 998368907993.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 399709863899 - 2⁸ = 399709863643 is a prime.

It is not a weakly prime, because it can be changed into another prime (399709863799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199854931949 + 199854931950.

It is an arithmetic number, because the mean of its divisors is an integer number (199854931950).

Almost surely, 2^399709863899 is an apocalyptic number.

399709863899 is a deficient number, since it is larger than the sum of its proper divisors (1).

399709863899 is an equidigital number, since it uses as much as digits as its factorization.

399709863899 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1428513408, while the sum is 80.

The spelling of 399709863899 in words is "three hundred ninety-nine billion, seven hundred nine million, eight hundred sixty-three thousand, eight hundred ninety-nine".