285438 has 16 divisors (see below), whose sum is σ = 577296. Its totient is φ = 94080.

The previous prime is 285433. The next prime is 285451. The reversal of 285438 is 834582.

It is a d-powerful number, because it can be written as 2 + 8⁴ + 4⁷ + 5⁴ + 3⁷ + 8⁶ .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285433) 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, 468 + ... + 888.

It is an arithmetic number, because the mean of its divisors is an integer number (36081).

2²⁸⁵⁴³⁸ is an apocalyptic number.

285438 is an abundant number, since it is smaller than the sum of its proper divisors (291858).

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

285438 is a wasteful number, since it uses less digits than its factorization.

285438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 539.

The product of its digits is 7680, while the sum is 30.

The square root of 285438 is about 534.2639796954. The cubic root of 285438 is about 65.8421387926.

The spelling of 285438 in words is "two hundred eighty-five thousand, four hundred thirty-eight".