285939 has 6 divisors (see below), whose sum is σ = 413036. Its totient is φ = 190620.

The previous prime is 285937. The next prime is 285949. The reversal of 285939 is 939582.

It is not a de Polignac number, because 285939 - 2¹ = 285937 is a prime.

It is a super-2 number, since 2×285939² = 163522223442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (285937) 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 5 ways as a sum of consecutive naturals, for example, 15877 + ... + 15894.

2²⁸⁵⁹³⁹ is an apocalyptic number.

285939 is a deficient number, since it is larger than the sum of its proper divisors (127097).

285939 is a wasteful number, since it uses less digits than its factorization.

285939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31777 (or 31774 counting only the distinct ones).

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

The square root of 285939 is about 534.7326434771. The cubic root of 285939 is about 65.8806382576.

The spelling of 285939 in words is "two hundred eighty-five thousand, nine hundred thirty-nine".