285321 has 4 divisors (see below), whose sum is σ = 380432. Its totient is φ = 190212.

The previous prime is 285317. The next prime is 285343. The reversal of 285321 is 123582.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 285321 - 2² = 285317 is a prime.

It is a D-number.

It is a Duffinian number.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 285321.

It is not an unprimeable number, because it can be changed into a prime (285301) 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, 47551 + ... + 47556.

It is an arithmetic number, because the mean of its divisors is an integer number (95108).

2²⁸⁵³²¹ is an apocalyptic number.

It is an amenable number.

285321 is a deficient number, since it is larger than the sum of its proper divisors (95111).

285321 is an equidigital number, since it uses as much as digits as its factorization.

285321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95110.

The product of its digits is 480, while the sum is 21.

The square root of 285321 is about 534.1544720397. The cubic root of 285321 is about 65.8331414120.

It can be divided in two parts, 285 and 321, that added together give a palindrome (606).

The spelling of 285321 in words is "two hundred eighty-five thousand, three hundred twenty-one".