285305 has 8 divisors (see below), whose sum is σ = 350592. Its totient is φ = 222768.

The previous prime is 285301. The next prime is 285317. The reversal of 285305 is 503582.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 285305 - 2² = 285301 is a prime.

It is a Duffinian number.

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 7 ways as a sum of consecutive naturals, for example, 449 + ... + 878.

It is an arithmetic number, because the mean of its divisors is an integer number (43824).

2²⁸⁵³⁰⁵ is an apocalyptic number.

It is an amenable number.

285305 is a deficient number, since it is larger than the sum of its proper divisors (65287).

285305 is a wasteful number, since it uses less digits than its factorization.

285305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1375.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 285305 is about 534.1394948887. The cubic root of 285305 is about 65.8319108098.

Adding to 285305 its reverse (503582), we get a palindrome (788887).

The spelling of 285305 in words is "two hundred eighty-five thousand, three hundred five".