285822 has 32 divisors (see below), whose sum is σ = 652800. Its totient is φ = 92664.

The previous prime is 285781. The next prime is 285823. The reversal of 285822 is 228582.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285823) by changing a digit.

285822 is an untouchable number, because it is not equal to the sum of proper divisors of any 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 15 ways as a sum of consecutive naturals, for example, 3579 + ... + 3657.

It is an arithmetic number, because the mean of its divisors is an integer number (20400).

2²⁸⁵⁸²² is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 285822, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (326400).

285822 is an abundant number, since it is smaller than the sum of its proper divisors (366978).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

285822 is a wasteful number, since it uses less digits than its factorization.

285822 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157 (or 151 counting only the distinct ones).

The product of its digits is 2560, while the sum is 27.

The square root of 285822 is about 534.6232318184. The cubic root of 285822 is about 65.8716513918.

It can be divided in two parts, 285 and 822, that multiplied together give a triangular number (234270 = T₆₈₄).

The spelling of 285822 in words is "two hundred eighty-five thousand, eight hundred twenty-two".