285340 has 24 divisors (see below), whose sum is σ = 654192. Its totient is φ = 103680.

The previous prime is 285317. The next prime is 285343. The reversal of 285340 is 43582.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285343) 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, 429 + ... + 868.

It is an arithmetic number, because the mean of its divisors is an integer number (27258).

2²⁸⁵³⁴⁰ is an apocalyptic number.

285340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

285340 is an abundant number, since it is smaller than the sum of its proper divisors (368852).

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

285340 is a wasteful number, since it uses less digits than its factorization.

285340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1317 (or 1315 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 285340 is about 534.1722568610. The cubic root of 285340 is about 65.8346026923.

It can be divided in two parts, 285 and 340, that added together give a 4-th power (625 = 5⁴).

The spelling of 285340 in words is "two hundred eighty-five thousand, three hundred forty".