285812 has 6 divisors (see below), whose sum is σ = 500178. Its totient is φ = 142904.

The previous prime is 285781. The next prime is 285823. The reversal of 285812 is 218582.

It can be written as a sum of positive squares in only one way, i.e., 274576 + 11236 = 524^2 + 106^2 .

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 285812.

It is an unprimeable number.

285812 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35723 + ... + 35730.

It is an arithmetic number, because the mean of its divisors is an integer number (83363).

2²⁸⁵⁸¹² is an apocalyptic number.

It is an amenable number.

285812 is a deficient number, since it is larger than the sum of its proper divisors (214366).

285812 is a wasteful number, since it uses less digits than its factorization.

285812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71457 (or 71455 counting only the distinct ones).

The product of its digits is 1280, while the sum is 26.

The square root of 285812 is about 534.6138793559. The cubic root of 285812 is about 65.8708831699.

The spelling of 285812 in words is "two hundred eighty-five thousand, eight hundred twelve".