285869 has 4 divisors (see below), whose sum is σ = 286944. Its totient is φ = 284796.

The previous prime is 285841. The next prime is 285871. The reversal of 285869 is 968582.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 285869 - 2⁸ = 285613 is a prime.

It is a super-2 number, since 2×285869² = 163442170322, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

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 285869.

It is not an unprimeable number, because it can be changed into a prime (285839) 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, 194 + ... + 780.

It is an arithmetic number, because the mean of its divisors is an integer number (71736).

2²⁸⁵⁸⁶⁹ is an apocalyptic number.

It is an amenable number.

285869 is a deficient number, since it is larger than the sum of its proper divisors (1075).

285869 is an equidigital number, since it uses as much as digits as its factorization.

285869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1074.

The product of its digits is 34560, while the sum is 38.

The square root of 285869 is about 534.6671862009. The cubic root of 285869 is about 65.8752617949.

The spelling of 285869 in words is "two hundred eighty-five thousand, eight hundred sixty-nine".