285143 has 4 divisors (see below), whose sum is σ = 286368. Its totient is φ = 283920.

The previous prime is 285139. The next prime is 285151. The reversal of 285143 is 341582.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 285143 - 2² = 285139 is a prime.

It is a d-powerful number, because it can be written as 2¹⁷ + 8³ + 1 + 5⁷ + 4⁷ + 3¹⁰ .

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 285143.

It is not an unprimeable number, because it can be changed into a prime (285113) 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 3 ways as a sum of consecutive naturals, for example, 143 + ... + 768.

It is an arithmetic number, because the mean of its divisors is an integer number (71592).

2²⁸⁵¹⁴³ is an apocalyptic number.

285143 is a deficient number, since it is larger than the sum of its proper divisors (1225).

285143 is an equidigital number, since it uses as much as digits as its factorization.

285143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1224.

The product of its digits is 960, while the sum is 23.

The square root of 285143 is about 533.9878275766. The cubic root of 285143 is about 65.8194483705.

It can be divided in two parts, 285 and 143, that multiplied together give a triangular number (40755 = T₂₈₅).

The spelling of 285143 in words is "two hundred eighty-five thousand, one hundred forty-three".