285904 has 20 divisors (see below), whose sum is σ = 562464. Its totient is φ = 140768.

The previous prime is 285871. The next prime is 285937. The reversal of 285904 is 409582.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (285871) and next prime (285937).

It is a congruent number.

It is an unprimeable number.

285904 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, 1629 + ... + 1795.

2²⁸⁵⁹⁰⁴ is an apocalyptic number.

It is an amenable number.

285904 is a deficient number, since it is larger than the sum of its proper divisors (276560).

285904 is a wasteful number, since it uses less digits than its factorization.

285904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282 (or 276 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 285904 is about 534.6999158407. The cubic root of 285904 is about 65.8779501359.

Subtracting from 285904 its product of nonzero digits (2880), we obtain a square (283024 = 532²).

The spelling of 285904 in words is "two hundred eighty-five thousand, nine hundred four".