399313313993 has 32 divisors (see below), whose sum is σ = 447752945664. Its totient is φ = 356009346000.

The previous prime is 399313313897. The next prime is 399313314019.

399313313993 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 399313313993 - 2²⁶ = 399246205129 is a prime.

It is a super-2 number, since 2×399313313993² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (399313318993) 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, 18038630 + ... + 18060752.

It is an arithmetic number, because the mean of its divisors is an integer number (13992279552).

Almost surely, 2^399313313993 is an apocalyptic number.

It is an amenable number.

399313313993 is a deficient number, since it is larger than the sum of its proper divisors (48439631671).

399313313993 is a wasteful number, since it uses less digits than its factorization.

399313313993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22418 (or 22396 counting only the distinct ones).

The product of its digits is 4782969, while the sum is 56.

The spelling of 399313313993 in words is "three hundred ninety-nine billion, three hundred thirteen million, three hundred thirteen thousand, nine hundred ninety-three".