285745 has 4 divisors (see below), whose sum is σ = 342900. Its totient is φ = 228592.

The previous prime is 285731. The next prime is 285749. The reversal of 285745 is 547582.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 43681 + 242064 = 209^2 + 492^2 .

It is a cyclic number.

It is not a de Polignac number, because 285745 - 2¹¹ = 283697 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

It is a d-powerful number, because it can be written as 2⁵ + 8³ + 7⁵ + 5⁵ + 4⁹ + 5⁵ .

It is not an unprimeable number, because it can be changed into a prime (285749) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28570 + ... + 28579.

It is an arithmetic number, because the mean of its divisors is an integer number (85725).

2²⁸⁵⁷⁴⁵ is an apocalyptic number.

It is an amenable number.

285745 is a deficient number, since it is larger than the sum of its proper divisors (57155).

285745 is an equidigital number, since it uses as much as digits as its factorization.

285745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57154.

The product of its digits is 11200, while the sum is 31.

The square root of 285745 is about 534.5512136363. The cubic root of 285745 is about 65.8657356206.

The spelling of 285745 in words is "two hundred eighty-five thousand, seven hundred forty-five".