399558765879 has 24 divisors (see below), whose sum is σ = 710326696352. Its totient is φ = 210756271680.

The previous prime is 399558765847. The next prime is 399558765887. The reversal of 399558765879 is 978567855993.

399558765879 is a `hidden beast` number, since 3 + 9 + 9 + 558 + 7 + 6 + 58 + 7 + 9 = 666.

It is not a de Polignac number, because 399558765879 - 2⁵ = 399558765847 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 399558765798 and 399558765807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399558765899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 243930052 + ... + 243931689.

Almost surely, 2^399558765879 is an apocalyptic number.

399558765879 is a gapful number since it is divisible by the number (39) formed by its first and last digit.

399558765879 is a deficient number, since it is larger than the sum of its proper divisors (310767930473).

399558765879 is a wasteful number, since it uses less digits than its factorization.

399558765879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 487861767 (or 487861764 counting only the distinct ones).

The product of its digits is 5143824000, while the sum is 81.

The spelling of 399558765879 in words is "three hundred ninety-nine billion, five hundred fifty-eight million, seven hundred sixty-five thousand, eight hundred seventy-nine".