399678313839 has 16 divisors (see below), whose sum is σ = 635513344512. Its totient is φ = 218457711648.

The previous prime is 399678313787. The next prime is 399678313841. The reversal of 399678313839 is 938313876993.

It is not a de Polignac number, because 399678313839 - 2⁷ = 399678313711 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (69).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399678313039) 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 15 ways as a sum of consecutive naturals, for example, 413745184 + ... + 413746149.

It is an arithmetic number, because the mean of its divisors is an integer number (39719584032).

Almost surely, 2^399678313839 is an apocalyptic number.

399678313839 is a deficient number, since it is larger than the sum of its proper divisors (235835030673).

399678313839 is a wasteful number, since it uses less digits than its factorization.

399678313839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 827491366.

The product of its digits is 158723712, while the sum is 69.

The spelling of 399678313839 in words is "three hundred ninety-nine billion, six hundred seventy-eight million, three hundred thirteen thousand, eight hundred thirty-nine".