285866 has 12 divisors (see below), whose sum is σ = 498978. Its totient is φ = 122472.

The previous prime is 285841. The next prime is 285871. The reversal of 285866 is 668582.

It can be written as a sum of positive squares in only one way, i.e., 148225 + 137641 = 385^2 + 371^2 .

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 285866.

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, 1361 + ... + 1556.

2²⁸⁵⁸⁶⁶ is an apocalyptic number.

285866 is a deficient number, since it is larger than the sum of its proper divisors (213112).

285866 is a wasteful number, since it uses less digits than its factorization.

285866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2933 (or 2926 counting only the distinct ones).

The product of its digits is 23040, while the sum is 35.

The square root of 285866 is about 534.6643807100. The cubic root of 285866 is about 65.8750313555.

The spelling of 285866 in words is "two hundred eighty-five thousand, eight hundred sixty-six".