285489 has 6 divisors (see below), whose sum is σ = 412386. Its totient is φ = 190320.

The previous prime is 285473. The next prime is 285497. The reversal of 285489 is 984582.

It can be written as a sum of positive squares in only one way, i.e., 166464 + 119025 = 408^2 + 345^2 .

It is not a de Polignac number, because 285489 - 2⁴ = 285473 is a prime.

It is not an unprimeable number, because it can be changed into a prime (285469) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 15852 + ... + 15869.

It is an arithmetic number, because the mean of its divisors is an integer number (68731).

2²⁸⁵⁴⁸⁹ is an apocalyptic number.

It is an amenable number.

285489 is a deficient number, since it is larger than the sum of its proper divisors (126897).

285489 is a wasteful number, since it uses less digits than its factorization.

285489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31727 (or 31724 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 285489 is about 534.3117067780. The cubic root of 285489 is about 65.8460599584.

It can be divided in two parts, 2 and 85489, that added together give a triangular number (85491 = T₄₁₃).

The spelling of 285489 in words is "two hundred eighty-five thousand, four hundred eighty-nine".