285404 has 12 divisors (see below), whose sum is σ = 570864. Its totient is φ = 122304.

The previous prime is 285377. The next prime is 285421. The reversal of 285404 is 404582.

285404 is an admirable number.

It is a hoax number, since the sum of its digits (23) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 285404.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 285404.

It is an unprimeable number.

285404 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, 5069 + ... + 5124.

It is an arithmetic number, because the mean of its divisors is an integer number (47572).

2²⁸⁵⁴⁰⁴ is an apocalyptic number.

It is an amenable number.

285404 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

285404 is a wasteful number, since it uses less digits than its factorization.

285404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10204 (or 10202 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 23.

The square root of 285404 is about 534.2321592716. The cubic root of 285404 is about 65.8395244227.

Adding to 285404 its reverse (404582), we get a palindrome (689986).

The spelling of 285404 in words is "two hundred eighty-five thousand, four hundred four".