285403 has 4 divisors (see below), whose sum is σ = 287280. Its totient is φ = 283528.

The previous prime is 285377. The next prime is 285421. The reversal of 285403 is 304582.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-285403 is a prime.

It is a Duffinian 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 (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 688 + ... + 1021.

It is an arithmetic number, because the mean of its divisors is an integer number (71820).

2²⁸⁵⁴⁰³ is an apocalyptic number.

285403 is a deficient number, since it is larger than the sum of its proper divisors (1877).

285403 is a wasteful number, since it uses less digits than its factorization.

285403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1876.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 285403 is about 534.2312233481. The cubic root of 285403 is about 65.8394475263.

Adding to 285403 its reverse (304582), we get a palindrome (589985).

The spelling of 285403 in words is "two hundred eighty-five thousand, four hundred three".