399942399919 has 2 divisors, whose sum is σ = 399942399920. Its totient is φ = 399942399918.

The previous prime is 399942399881. The next prime is 399942400009. The reversal of 399942399919 is 919993249993.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 399942399919 - 2³³ = 391352465327 is a prime.

It is a super-2 number, since 2×399942399919² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (399942399319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199971199959 + 199971199960.

It is an arithmetic number, because the mean of its divisors is an integer number (199971199960).

Almost surely, 2^399942399919 is an apocalyptic number.

399942399919 is a deficient number, since it is larger than the sum of its proper divisors (1).

399942399919 is an equidigital number, since it uses as much as digits as its factorization.

399942399919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 344373768, while the sum is 76.

The spelling of 399942399919 in words is "three hundred ninety-nine billion, nine hundred forty-two million, three hundred ninety-nine thousand, nine hundred nineteen".