399686404686993 has 12 divisors (see below), whose sum is σ = 577993781064960. Its totient is φ = 266148845757816.

The previous prime is 399686404686929. The next prime is 399686404687061.

399686404686993 is a `hidden beast` number, since 3 + 9 + 9 + 6 + 86 + 4 + 0 + 468 + 69 + 9 + 3 = 666.

399686404686993 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 399686404686993 - 2⁶ = 399686404686929 is a prime.

It is a super-2 number, since 2×399686404686993² (a number of 30 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (399686404687993) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25729772373 + ... + 25729787906.

It is an arithmetic number, because the mean of its divisors is an integer number (48166148422080).

Almost surely, 2^{399686404686993} is an apocalyptic number.

It is an amenable number.

399686404686993 is a deficient number, since it is larger than the sum of its proper divisors (178307376377967).

399686404686993 is a wasteful number, since it uses less digits than its factorization.

399686404686993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51459561148 (or 51459561145 counting only the distinct ones).

The product of its (nonzero) digits is 78364164096, while the sum is 90.

The spelling of 399686404686993 in words is "three hundred ninety-nine trillion, six hundred eighty-six billion, four hundred four million, six hundred eighty-six thousand, nine hundred ninety-three".