8009909 has 4 divisors (see below), whose sum is σ = 8020620. Its totient is φ = 7999200.

The previous prime is 8009893. The next prime is 8009927. The reversal of 8009909 is 9099008.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7409284 + 600625 = 2722^2 + 775^2 .

It is a cyclic number.

It is not a de Polignac number, because 8009909 - 2⁴ = 8009893 is a prime.

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 (8009929) 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 3 ways as a sum of consecutive naturals, for example, 4142 + ... + 5759.

It is an arithmetic number, because the mean of its divisors is an integer number (2005155).

Almost surely, 2^8009909 is an apocalyptic number.

It is an amenable number.

8009909 is a deficient number, since it is larger than the sum of its proper divisors (10711).

8009909 is an equidigital number, since it uses as much as digits as its factorization.

8009909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10710.

The product of its (nonzero) digits is 5832, while the sum is 35.

The square root of 8009909 is about 2830.1782629368. The cubic root of 8009909 is about 200.0825409303.

The spelling of 8009909 in words is "eight million, nine thousand, nine hundred nine".