11805009 has 4 divisors (see below), whose sum is σ = 15740016. Its totient is φ = 7870004.

The previous prime is 11804999. The next prime is 11805011. The reversal of 11805009 is 90050811.

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.

It is a cyclic number.

It is not a de Polignac number, because 11805009 - 2⁴ = 11804993 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11805009.

It is not an unprimeable number, because it can be changed into a prime (11805019) 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, 1967499 + ... + 1967504.

It is an arithmetic number, because the mean of its divisors is an integer number (3935004).

Almost surely, 2^11805009 is an apocalyptic number.

It is an amenable number.

11805009 is a deficient number, since it is larger than the sum of its proper divisors (3935007).

11805009 is an equidigital number, since it uses as much as digits as its factorization.

11805009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3935006.

The product of its (nonzero) digits is 360, while the sum is 24.

The square root of 11805009 is about 3435.8418182448. The cubic root of 11805009 is about 227.6960207254.

The spelling of 11805009 in words is "eleven million, eight hundred five thousand, nine".