285885 has 12 divisors (see below), whose sum is σ = 495612. Its totient is φ = 152448.

The previous prime is 285871. The next prime is 285937. The reversal of 285885 is 588582.

It can be written as a sum of positive squares in 2 ways, for example, as 116964 + 168921 = 342^2 + 411^2 .

It is not a de Polignac number, because 285885 - 2⁷ = 285757 is a prime.

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 285885.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3132 + ... + 3221.

It is an arithmetic number, because the mean of its divisors is an integer number (41301).

2²⁸⁵⁸⁸⁵ is an apocalyptic number.

It is an amenable number.

285885 is a deficient number, since it is larger than the sum of its proper divisors (209727).

285885 is a wasteful number, since it uses less digits than its factorization.

285885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6364 (or 6361 counting only the distinct ones).

The product of its digits is 25600, while the sum is 36.

The square root of 285885 is about 534.6821485705. The cubic root of 285885 is about 65.8764907780.

The spelling of 285885 in words is "two hundred eighty-five thousand, eight hundred eighty-five".