285985 has 8 divisors (see below), whose sum is σ = 392256. Its totient is φ = 196080.

The previous prime is 285983. The next prime is 285997. The reversal of 285985 is 589582.

It is a happy number.

285985 is nontrivially palindromic in base 6.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 285985 - 2¹ = 285983 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (285983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4051 + ... + 4120.

It is an arithmetic number, because the mean of its divisors is an integer number (49032).

2²⁸⁵⁹⁸⁵ is an apocalyptic number.

It is an amenable number.

285985 is a deficient number, since it is larger than the sum of its proper divisors (106271).

285985 is an equidigital number, since it uses as much as digits as its factorization.

285985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8183.

The product of its digits is 28800, while the sum is 37.

The square root of 285985 is about 534.7756538961. The cubic root of 285985 is about 65.8841708838.

The spelling of 285985 in words is "two hundred eighty-five thousand, nine hundred eighty-five".