285887 has 4 divisors (see below), whose sum is σ = 326736. Its totient is φ = 245040.

The previous prime is 285871. The next prime is 285937. The reversal of 285887 is 788582.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 788582 = 2 ⋅394291.

It is a cyclic number.

It is not a de Polignac number, because 285887 - 2⁴ = 285871 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 285887.

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 285887.

It is not an unprimeable number, because it can be changed into a prime (285827) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20414 + ... + 20427.

It is an arithmetic number, because the mean of its divisors is an integer number (81684).

2²⁸⁵⁸⁸⁷ is an apocalyptic number.

285887 is a deficient number, since it is larger than the sum of its proper divisors (40849).

285887 is an equidigital number, since it uses as much as digits as its factorization.

285887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40848.

The product of its digits is 35840, while the sum is 38.

The square root of 285887 is about 534.6840188373. The cubic root of 285887 is about 65.8766443977.

Subtracting from 285887 its product of digits (35840), we obtain a cube (250047 = 63³).

It can be divided in two parts, 28 and 5887, that multiplied together give a square (164836 = 406²).

The spelling of 285887 in words is "two hundred eighty-five thousand, eight hundred eighty-seven".