285439 has 12 divisors (see below), whose sum is σ = 359632. Its totient is φ = 221760.

The previous prime is 285433. The next prime is 285451. The reversal of 285439 is 934582.

It is not a de Polignac number, because 285439 - 2⁹ = 284927 is a prime.

It is an Ulam number.

It is a d-powerful number, because it can be written as 2¹⁰ + 8⁶ + 4 + 5⁶ + 3⁸ + 9² .

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 285439.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (285433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 679 + ... + 1015.

2²⁸⁵⁴³⁹ is an apocalyptic number.

285439 is a deficient number, since it is larger than the sum of its proper divisors (74193).

285439 is a wasteful number, since it uses less digits than its factorization.

285439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366 (or 355 counting only the distinct ones).

The product of its digits is 8640, while the sum is 31.

The square root of 285439 is about 534.2649155616. The cubic root of 285439 is about 65.8422156827.

The spelling of 285439 in words is "two hundred eighty-five thousand, four hundred thirty-nine".