399867768993 has 32 divisors (see below), whose sum is σ = 664844285952. Its totient is φ = 207683193600.

The previous prime is 399867768941. The next prime is 399867768997.

399867768993 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 399867768993 - 2²⁸ = 399599333537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (399867768997) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1043428 + ... + 1374218.

It is an arithmetic number, because the mean of its divisors is an integer number (20776383936).

Almost surely, 2^399867768993 is an apocalyptic number.

399867768993 is a gapful number since it is divisible by the number (33) formed by its first and last digit.

It is an amenable number.

399867768993 is a deficient number, since it is larger than the sum of its proper divisors (264976516959).

399867768993 is a wasteful number, since it uses less digits than its factorization.

399867768993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336045.

The product of its digits is 6666395904, while the sum is 84.

The spelling of 399867768993 in words is "three hundred ninety-nine billion, eight hundred sixty-seven million, seven hundred sixty-eight thousand, nine hundred ninety-three".