285999 has 8 divisors (see below), whose sum is σ = 435840. Its totient is φ = 163416.

The previous prime is 285997. The next prime is 286001. The reversal of 285999 is 999582.

It is an interprime number because it is at equal distance from previous prime (285997) and next prime (286001).

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

It is not a de Polignac number, because 285999 - 2¹ = 285997 is a prime.

285999 is a modest number, since divided by 999 gives 285 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 285999.

It is a congruent number.

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

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6789 + ... + 6830.

It is an arithmetic number, because the mean of its divisors is an integer number (54480).

2²⁸⁵⁹⁹⁹ is an apocalyptic number.

285999 is a deficient number, since it is larger than the sum of its proper divisors (149841).

285999 is a wasteful number, since it uses less digits than its factorization.

285999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13629.

The product of its digits is 58320, while the sum is 42.

The square root of 285999 is about 534.7887433370. The cubic root of 285999 is about 65.8852459558.

The spelling of 285999 in words is "two hundred eighty-five thousand, nine hundred ninety-nine".