285243 has 24 divisors (see below), whose sum is σ = 471552. Its totient is φ = 150144.

The previous prime is 285227. The next prime is 285251. The reversal of 285243 is 342582.

It is not a de Polignac number, because 285243 - 2⁴ = 285227 is a prime.

285243 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285283) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6046 + ... + 6092.

It is an arithmetic number, because the mean of its divisors is an integer number (19648).

2²⁸⁵²⁴³ is an apocalyptic number.

285243 is a deficient number, since it is larger than the sum of its proper divisors (186309).

285243 is a wasteful number, since it uses less digits than its factorization.

285243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91 (or 74 counting only the distinct ones).

The product of its digits is 1920, while the sum is 24.

The square root of 285243 is about 534.0814544618. The cubic root of 285243 is about 65.8271417916.

It can be divided in two parts, 285 and 243, that added together give a triangular number (528 = T₃₂).

The spelling of 285243 in words is "two hundred eighty-five thousand, two hundred forty-three".