399992255999 has 4 divisors (see below), whose sum is σ = 457134006864. Its totient is φ = 342850505136.

The previous prime is 399992255959. The next prime is 399992256007. The reversal of 399992255999 is 999552299993.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 399992255999 - 2¹⁶ = 399992190463 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399992255939) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28570875422 + ... + 28570875435.

It is an arithmetic number, because the mean of its divisors is an integer number (114283501716).

Almost surely, 2^399992255999 is an apocalyptic number.

399992255999 is a deficient number, since it is larger than the sum of its proper divisors (57141750865).

399992255999 is an equidigital number, since it uses as much as digits as its factorization.

399992255999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57141750864.

The product of its digits is 1434890700, while the sum is 80.

The spelling of 399992255999 in words is "three hundred ninety-nine billion, nine hundred ninety-two million, two hundred fifty-five thousand, nine hundred ninety-nine".