399992 has 8 divisors (see below), whose sum is σ = 750000. Its totient is φ = 199992.

The previous prime is 399989. The next prime is 400009. The reversal of 399992 is 299993.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24992 + ... + 25007.

It is an arithmetic number, because the mean of its divisors is an integer number (93750).

2³⁹⁹⁹⁹² is an apocalyptic number.

It is an amenable number.

399992 is a deficient number, since it is larger than the sum of its proper divisors (350008).

399992 is a wasteful number, since it uses less digits than its factorization.

399992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50005 (or 50001 counting only the distinct ones).

The product of its digits is 39366, while the sum is 41.

The square root of 399992 is about 632.4492074467. The cubic root of 399992 is about 73.6801387653.

Subtracting from 399992 its reverse (299993), we obtain a palindrome (99999).

The spelling of 399992 in words is "three hundred ninety-nine thousand, nine hundred ninety-two".