823523 has 4 divisors (see below), whose sum is σ = 829200. Its totient is φ = 817848.

The previous prime is 823519. The next prime is 823541. The reversal of 823523 is 325328.

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 823523 - 2² = 823519 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a nialpdrome in base 7.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 823523.

It is not an unprimeable number, because it can be changed into a prime (823553) 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, 2615 + ... + 2912.

It is an arithmetic number, because the mean of its divisors is an integer number (207300).

2⁸²³⁵²³ is an apocalyptic number.

823523 is a deficient number, since it is larger than the sum of its proper divisors (5677).

823523 is a wasteful number, since it uses less digits than its factorization.

823523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5676.

The product of its digits is 1440, while the sum is 23.

The square root of 823523 is about 907.4816802559. The cubic root of 823523 is about 93.7328691662.

The spelling of 823523 in words is "eight hundred twenty-three thousand, five hundred twenty-three".