285863 has 4 divisors (see below), whose sum is σ = 287640. Its totient is φ = 284088.

The previous prime is 285841. The next prime is 285871. The reversal of 285863 is 368582.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 368582 = 2 ⋅184291.

It is a cyclic number.

It is not a de Polignac number, because 285863 - 2¹⁰ = 284839 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285823) 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, 620 + ... + 977.

It is an arithmetic number, because the mean of its divisors is an integer number (71910).

2²⁸⁵⁸⁶³ is an apocalyptic number.

285863 is a deficient number, since it is larger than the sum of its proper divisors (1777).

285863 is a wasteful number, since it uses less digits than its factorization.

285863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1776.

The product of its digits is 11520, while the sum is 32.

The square root of 285863 is about 534.6615752044. The cubic root of 285863 is about 65.8748009144.

It can be divided in two parts, 28586 and 3, that multiplied together give a palindrome (85758).

The spelling of 285863 in words is "two hundred eighty-five thousand, eight hundred sixty-three".