285399 has 12 divisors (see below), whose sum is σ = 434200. Its totient is φ = 180144.

The previous prime is 285377. The next prime is 285421. The reversal of 285399 is 993582.

It is an interprime number because it is at equal distance from previous prime (285377) and next prime (285421).

It is a de Polignac number, because none of the positive numbers 2^k-285399 is a prime.

It is a Duffinian number.

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 285399.

It is not an unprimeable number, because it can be changed into a prime (285199) 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 11 ways as a sum of consecutive naturals, for example, 664 + ... + 1005.

2²⁸⁵³⁹⁹ is an apocalyptic number.

285399 is a deficient number, since it is larger than the sum of its proper divisors (148801).

285399 is a wasteful number, since it uses less digits than its factorization.

285399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1694 (or 1691 counting only the distinct ones).

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

The square root of 285399 is about 534.2274796377. The cubic root of 285399 is about 65.8391399390.

The spelling of 285399 in words is "two hundred eighty-five thousand, three hundred ninety-nine".