9909823 has 32 divisors (see below), whose sum is σ = 13128192. Its totient is φ = 7257600.

The previous prime is 9909799. The next prime is 9909833. The reversal of 9909823 is 3289099.

It is a happy number.

It is not a de Polignac number, because 9909823 - 2⁵ = 9909791 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9909833) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 135715 + ... + 135787.

It is an arithmetic number, because the mean of its divisors is an integer number (410256).

Almost surely, 2^9909823 is an apocalyptic number.

9909823 is a deficient number, since it is larger than the sum of its proper divisors (3218369).

9909823 is a wasteful number, since it uses less digits than its factorization.

9909823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175.

The product of its (nonzero) digits is 34992, while the sum is 40.

The square root of 9909823 is about 3147.9871346624. The cubic root of 9909823 is about 214.7939110430.

The spelling of 9909823 in words is "nine million, nine hundred nine thousand, eight hundred twenty-three".