285920 has 24 divisors (see below), whose sum is σ = 675864. Its totient is φ = 114304.

The previous prime is 285871. The next prime is 285937. The reversal of 285920 is 29582.

It is a self number, because there is not a number n which added to its sum of digits gives 285920.

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 285920.

It is an unprimeable number.

285920 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, 734 + ... + 1053.

It is an arithmetic number, because the mean of its divisors is an integer number (28161).

2²⁸⁵⁹²⁰ is an apocalyptic number.

285920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

285920 is an abundant number, since it is smaller than the sum of its proper divisors (389944).

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

285920 is a wasteful number, since it uses less digits than its factorization.

285920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1802 (or 1794 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 285920 is about 534.7148772944. The cubic root of 285920 is about 65.8791790188.

The spelling of 285920 in words is "two hundred eighty-five thousand, nine hundred twenty".