285442 has 12 divisors (see below), whose sum is σ = 446166. Its totient is φ = 136880.

The previous prime is 285433. The next prime is 285451. The reversal of 285442 is 244582.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (285433) and next prime (285451).

It can be written as a sum of positive squares in only one way, i.e., 281961 + 3481 = 531^2 + 59^2 .

It is an Ulam number.

It is an unprimeable number.

285442 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 (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4809 + ... + 4867.

2²⁸⁵⁴⁴² is an apocalyptic number.

285442 is a deficient number, since it is larger than the sum of its proper divisors (160724).

285442 is an equidigital number, since it uses as much as digits as its factorization.

285442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161 (or 102 counting only the distinct ones).

The product of its digits is 2560, while the sum is 25.

The square root of 285442 is about 534.2677231501. The cubic root of 285442 is about 65.8424463519.

It can be divided in two parts, 285 and 442, that added together give a palindrome (727).

The spelling of 285442 in words is "two hundred eighty-five thousand, four hundred forty-two".