400804 has 12 divisors (see below), whose sum is σ = 709324. Its totient is φ = 198144.

The previous prime is 400759. The next prime is 400823. The reversal of 400804 is 408004.

400804 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 304704 + 96100 = 552^2 + 310^2 .

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

400804 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 129 + ... + 904.

2⁴⁰⁰⁸⁰⁴ is an apocalyptic number.

It is an amenable number.

400804 is a deficient number, since it is larger than the sum of its proper divisors (308520).

400804 is a wasteful number, since it uses less digits than its factorization.

400804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1134 (or 1132 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

The square root of 400804 is about 633.0908307660. The cubic root of 400804 is about 73.7299629565.

Adding to 400804 its reverse (408004), we get a palindrome (808808).

The spelling of 400804 in words is "four hundred thousand, eight hundred four".