255823 has 4 divisors (see below), whose sum is σ = 258280. Its totient is φ = 253368.

The previous prime is 255803. The next prime is 255839. The reversal of 255823 is 328552.

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-255823 is a prime.

It is a d-powerful number, because it can be written as 2 + 5 + 8³ + 5⁷ + 2⁵ + 3¹¹ .

It is a Duffinian number.

255823 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255803) 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 3 ways as a sum of consecutive naturals, for example, 1065 + ... + 1282.

It is an arithmetic number, because the mean of its divisors is an integer number (64570).

2²⁵⁵⁸²³ is an apocalyptic number.

255823 is a deficient number, since it is larger than the sum of its proper divisors (2457).

255823 is a wasteful number, since it uses less digits than its factorization.

255823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2456.

The product of its digits is 2400, while the sum is 25.

The square root of 255823 is about 505.7894818993. The cubic root of 255823 is about 63.4814048513.

The spelling of 255823 in words is "two hundred fifty-five thousand, eight hundred twenty-three".