399999999992 has 16 divisors (see below), whose sum is σ = 775862069400. Its totient is φ = 193103448160.

The previous prime is 399999999977. The next prime is 400000000019. The reversal of 399999999992 is 299999999993.

It is a junction number, because it is equal to n+sod(n) for n = 399999999895 and 399999999904.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 862068734 + ... + 862069197.

Almost surely, 2^399999999992 is an apocalyptic number.

It is an amenable number.

399999999992 is a deficient number, since it is larger than the sum of its proper divisors (375862069408).

399999999992 is a wasteful number, since it uses less digits than its factorization.

399999999992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1724137966 (or 1724137962 counting only the distinct ones).

The product of its digits is 20920706406, while the sum is 95.

Subtracting from 399999999992 its reverse (299999999993), we obtain a palindrome (99999999999).

The spelling of 399999999992 in words is "three hundred ninety-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-two".