9933809 has 4 divisors (see below), whose sum is σ = 9956004. Its totient is φ = 9911616.

The previous prime is 9933793. The next prime is 9933811. The reversal of 9933809 is 9083399.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9083399 = 13 ⋅698723.

It can be written as a sum of positive squares in 2 ways, for example, as 4293184 + 5640625 = 2072^2 + 2375^2 .

It is a cyclic number.

It is not a de Polignac number, because 9933809 - 2⁴ = 9933793 is a prime.

It is a super-2 number, since 2×9933809² = 197361122496962, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9933509) 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, 10412 + ... + 11325.

It is an arithmetic number, because the mean of its divisors is an integer number (2489001).

Almost surely, 2^9933809 is an apocalyptic number.

It is an amenable number.

9933809 is a deficient number, since it is larger than the sum of its proper divisors (22195).

9933809 is a wasteful number, since it uses less digits than its factorization.

9933809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22194.

The product of its (nonzero) digits is 52488, while the sum is 41.

The square root of 9933809 is about 3151.7945681786. The cubic root of 9933809 is about 214.9670690504.

The spelling of 9933809 in words is "nine million, nine hundred thirty-three thousand, eight hundred nine".