399666666993 has 32 divisors (see below), whose sum is σ = 594933706752. Its totient is φ = 236556936000.

The previous prime is 399666666947. The next prime is 399666667021.

399666666993 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 399666666993 - 2¹⁷ = 399666535921 is a prime.

It is not an unprimeable number, because it can be changed into a prime (399666666493) 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, 14035296 + ... + 14063742.

It is an arithmetic number, because the mean of its divisors is an integer number (18591678336).

Almost surely, 2^399666666993 is an apocalyptic number.

399666666993 is a gapful number since it is divisible by the number (33) formed by its first and last digit.

It is an amenable number.

399666666993 is a deficient number, since it is larger than the sum of its proper divisors (195267039759).

399666666993 is a wasteful number, since it uses less digits than its factorization.

399666666993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38405.

The product of its digits is 2754990144, while the sum is 78.

The spelling of 399666666993 in words is "three hundred ninety-nine billion, six hundred sixty-six million, six hundred sixty-six thousand, nine hundred ninety-three".