285993 has 12 divisors (see below), whose sum is σ = 423280. Its totient is φ = 185976.

The previous prime is 285983. The next prime is 285997. The reversal of 285993 is 399582.

It is not a de Polignac number, because 285993 - 2⁴ = 285977 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (285997) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18 + ... + 756.

2²⁸⁵⁹⁹³ is an apocalyptic number.

It is an amenable number.

285993 is a deficient number, since it is larger than the sum of its proper divisors (137287).

285993 is a wasteful number, since it uses less digits than its factorization.

285993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 788 (or 785 counting only the distinct ones).

The product of its digits is 19440, while the sum is 36.

The square root of 285993 is about 534.7831336159. The cubic root of 285993 is about 65.8847852150.

The spelling of 285993 in words is "two hundred eighty-five thousand, nine hundred ninety-three".