285799 has 4 divisors (see below), whose sum is σ = 287560. Its totient is φ = 284040.

The previous prime is 285781. The next prime is 285823. The reversal of 285799 is 997582.

285799 = T₄₃₅ + T₄₃₆ + T₄₃₇.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 997582 = 2 ⋅498791.

It is a cyclic number.

It is not a de Polignac number, because 285799 - 2⁵ = 285767 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285709) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 609 + ... + 970.

It is an arithmetic number, because the mean of its divisors is an integer number (71890).

2²⁸⁵⁷⁹⁹ is an apocalyptic number.

285799 is the 437-th centered triangular number.

285799 is a deficient number, since it is larger than the sum of its proper divisors (1761).

285799 is a wasteful number, since it uses less digits than its factorization.

285799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1760.

The product of its digits is 45360, while the sum is 40.

The square root of 285799 is about 534.6017209101. The cubic root of 285799 is about 65.8698844545.

The spelling of 285799 in words is "two hundred eighty-five thousand, seven hundred ninety-nine".