285009 has 4 divisors (see below), whose sum is σ = 380016. Its totient is φ = 190004.

The previous prime is 285007. The next prime is 285023. The reversal of 285009 is 900582.

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 a cyclic number.

It is not a de Polignac number, because 285009 - 2¹ = 285007 is a prime.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 285009.

It is not an unprimeable number, because it can be changed into a prime (285007) 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, 47499 + ... + 47504.

It is an arithmetic number, because the mean of its divisors is an integer number (95004).

2²⁸⁵⁰⁰⁹ is an apocalyptic number.

It is an amenable number.

285009 is a deficient number, since it is larger than the sum of its proper divisors (95007).

285009 is an equidigital number, since it uses as much as digits as its factorization.

285009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95006.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 285009 is about 533.8623418073. The cubic root of 285009 is about 65.8091363656.

The spelling of 285009 in words is "two hundred eighty-five thousand, nine".