823423 has 4 divisors (see below), whose sum is σ = 859248. Its totient is φ = 787600.

The previous prime is 823421. The next prime is 823447. The reversal of 823423 is 324328.

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 823423 - 2¹ = 823421 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

823423 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 823394 and 823403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (823421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17878 + ... + 17923.

It is an arithmetic number, because the mean of its divisors is an integer number (214812).

2⁸²³⁴²³ is an apocalyptic number.

823423 is a deficient number, since it is larger than the sum of its proper divisors (35825).

823423 is a wasteful number, since it uses less digits than its factorization.

823423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35824.

The product of its digits is 1152, while the sum is 22.

The square root of 823423 is about 907.4265810522. The cubic root of 823423 is about 93.7290750336.

The spelling of 823423 in words is "eight hundred twenty-three thousand, four hundred twenty-three".