285945 has 16 divisors (see below), whose sum is σ = 499392. Its totient is φ = 138560.

The previous prime is 285937. The next prime is 285949. The reversal of 285945 is 549582.

It is not a de Polignac number, because 285945 - 2³ = 285937 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is an Ulam number.

285945 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (285949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 702 + ... + 1031.

It is an arithmetic number, because the mean of its divisors is an integer number (31212).

2²⁸⁵⁹⁴⁵ is an apocalyptic number.

It is an amenable number.

285945 is a deficient number, since it is larger than the sum of its proper divisors (213447).

285945 is a wasteful number, since it uses less digits than its factorization.

285945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1752.

The product of its digits is 14400, while the sum is 33.

The square root of 285945 is about 534.7382537279. The cubic root of 285945 is about 65.8810990564.

The spelling of 285945 in words is "two hundred eighty-five thousand, nine hundred forty-five".