9823 has 8 divisors (see below), whose sum is σ = 11520. Its totient is φ = 8280.

The previous prime is 9817. The next prime is 9829. The reversal of 9823 is 3289.

It is an interprime number because it is at equal distance from previous prime (9817) and next prime (9829).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9823 - 2⁵ = 9791 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 9794 and 9803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 186 + ... + 232.

It is an arithmetic number, because the mean of its divisors is an integer number (1440).

2⁹⁸²³ is an apocalyptic number.

9823 is a deficient number, since it is larger than the sum of its proper divisors (1697).

9823 is a wasteful number, since it uses less digits than its factorization.

9823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77.

The product of its digits is 432, while the sum is 22.

The square root of 9823 is about 99.1110488291. Note that the first 3 decimals coincide. The cubic root of 9823 is about 21.4164778321.

Subtracting from 9823 its sum of digits (22), we obtain a square (9801 = 99²).

It can be divided in two parts, 98 and 23, that added together give a palindrome (121).

The spelling of 9823 in words is "nine thousand, eight hundred twenty-three".