9813809 has 4 divisors (see below), whose sum is σ = 9821040. Its totient is φ = 9806580.

The previous prime is 9813787. The next prime is 9813827. The reversal of 9813809 is 9083189.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9083189 = 149 ⋅60961.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9813809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9813829) 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, 899 + ... + 4520.

It is an arithmetic number, because the mean of its divisors is an integer number (2455260).

Almost surely, 2^9813809 is an apocalyptic number.

It is an amenable number.

9813809 is a deficient number, since it is larger than the sum of its proper divisors (7231).

9813809 is a wasteful number, since it uses less digits than its factorization.

9813809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7230.

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 9813809 is about 3132.6999537140. The cubic root of 9813809 is about 214.0979622532.

The spelling of 9813809 in words is "nine million, eight hundred thirteen thousand, eight hundred nine".