505823 has 2 divisors, whose sum is σ = 505824. Its totient is φ = 505822.

The previous prime is 505819. The next prime is 505867. The reversal of 505823 is 328505.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 505823 - 2² = 505819 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (505123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252911 + 252912.

It is an arithmetic number, because the mean of its divisors is an integer number (252912).

2⁵⁰⁵⁸²³ is an apocalyptic number.

505823 is a deficient number, since it is larger than the sum of its proper divisors (1).

505823 is an equidigital number, since it uses as much as digits as its factorization.

505823 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 505823 is about 711.2123452247. The cubic root of 505823 is about 79.6769787211.

The spelling of 505823 in words is "five hundred five thousand, eight hundred twenty-three".