285823 has 2 divisors, whose sum is σ = 285824. Its totient is φ = 285822.

The previous prime is 285781. The next prime is 285827. The reversal of 285823 is 328582.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-285823 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 285791 and 285800.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (285827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 142911 + 142912.

It is an arithmetic number, because the mean of its divisors is an integer number (142912).

2²⁸⁵⁸²³ is an apocalyptic number.

285823 is a deficient number, since it is larger than the sum of its proper divisors (1).

285823 is an equidigital number, since it uses as much as digits as its factorization.

285823 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3840, while the sum is 28.

The square root of 285823 is about 534.6241670557. The cubic root of 285823 is about 65.8717282130.

The spelling of 285823 in words is "two hundred eighty-five thousand, eight hundred twenty-three".