399404 has 12 divisors (see below), whose sum is σ = 721728. Its totient is φ = 193200.

The previous prime is 399403. The next prime is 399409. The reversal of 399404 is 404993.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (399401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1487 + ... + 1734.

It is an arithmetic number, because the mean of its divisors is an integer number (60144).

2³⁹⁹⁴⁰⁴ is an apocalyptic number.

It is an amenable number.

399404 is a deficient number, since it is larger than the sum of its proper divisors (322324).

399404 is a wasteful number, since it uses less digits than its factorization.

399404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3256 (or 3254 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 399404 is about 631.9841770171. The cubic root of 399404 is about 73.6440170695.

The spelling of 399404 in words is "three hundred ninety-nine thousand, four hundred four".