520823 has 4 divisors (see below), whose sum is σ = 533568. Its totient is φ = 508080.

The previous prime is 520813. The next prime is 520837. The reversal of 520823 is 328025.

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

It is a cyclic number.

It is not a de Polignac number, because 520823 - 2⁶ = 520759 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 520795 and 520804.

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 520823.

It is not an unprimeable number, because it can be changed into a prime (520813) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6311 + ... + 6392.

It is an arithmetic number, because the mean of its divisors is an integer number (133392).

2⁵²⁰⁸²³ is an apocalyptic number.

520823 is a deficient number, since it is larger than the sum of its proper divisors (12745).

520823 is a wasteful number, since it uses less digits than its factorization.

520823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12744.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 520823 is about 721.6806773082. The cubic root of 520823 is about 80.4569166217.

Adding to 520823 its reverse (328025), we get a palindrome (848848).

The spelling of 520823 in words is "five hundred twenty thousand, eight hundred twenty-three".