285605 has 6 divisors (see below), whose sum is σ = 344166. Its totient is φ = 227528.

The previous prime is 285599. The next prime is 285611. The reversal of 285605 is 506582.

It is an interprime number because it is at equal distance from previous prime (285599) and next prime (285611).

It can be written as a sum of positive squares in only one way, i.e., 228484 + 57121 = 478^2 + 239^2 .

It is not a de Polignac number, because 285605 - 2¹² = 281509 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1076 + ... + 1314.

It is an arithmetic number, because the mean of its divisors is an integer number (57361).

2²⁸⁵⁶⁰⁵ is an apocalyptic number.

It is an amenable number.

285605 is a deficient number, since it is larger than the sum of its proper divisors (58561).

285605 is an frugal number, since it uses more digits than its factorization.

285605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 483 (or 244 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 285605 is about 534.4202466224. The cubic root of 285605 is about 65.8549769495.

The spelling of 285605 in words is "two hundred eighty-five thousand, six hundred five".