285345 has 24 divisors (see below), whose sum is σ = 525096. Its totient is φ = 142848.

The previous prime is 285343. The next prime is 285377. The reversal of 285345 is 543582.

It can be written as a sum of positive squares in 4 ways, for example, as 63504 + 221841 = 252^2 + 471^2 .

It is not a de Polignac number, because 285345 - 2¹ = 285343 is a prime.

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 23 ways as a sum of consecutive naturals, for example, 579 + ... + 951.

It is an arithmetic number, because the mean of its divisors is an integer number (21879).

2²⁸⁵³⁴⁵ is an apocalyptic number.

It is an amenable number.

285345 is a deficient number, since it is larger than the sum of its proper divisors (239751).

285345 is a wasteful number, since it uses less digits than its factorization.

285345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401 (or 398 counting only the distinct ones).

The product of its digits is 4800, while the sum is 27.

The square root of 285345 is about 534.1769369788. The cubic root of 285345 is about 65.8349872290.

It can be divided in two parts, 285 and 345, that added together give a triangular number (630 = T₃₅).

The spelling of 285345 in words is "two hundred eighty-five thousand, three hundred forty-five".