9923809 has 8 divisors (see below), whose sum is σ = 11373248. Its totient is φ = 8482320.

The previous prime is 9923803. The next prime is 9923819. The reversal of 9923809 is 9083299.

It is a happy number.

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

It is not a de Polignac number, because 9923809 - 2¹³ = 9915617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9923803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 994 + ... + 4564.

It is an arithmetic number, because the mean of its divisors is an integer number (1421656).

Almost surely, 2^9923809 is an apocalyptic number.

It is an amenable number.

9923809 is a deficient number, since it is larger than the sum of its proper divisors (1449439).

9923809 is a wasteful number, since it uses less digits than its factorization.

9923809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3975.

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

The square root of 9923809 is about 3150.2077709256. The cubic root of 9923809 is about 214.8949116861.

The spelling of 9923809 in words is "nine million, nine hundred twenty-three thousand, eight hundred nine".