11808309 has 4 divisors (see below), whose sum is σ = 15744416. Its totient is φ = 7872204.

The previous prime is 11808301. The next prime is 11808311. The reversal of 11808309 is 90380811.

11808309 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

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 not a de Polignac number, because 11808309 - 2³ = 11808301 is a prime.

It is a super-2 number, since 2×11808309² = 278872322878962, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11808301) 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, 1968049 + ... + 1968054.

It is an arithmetic number, because the mean of its divisors is an integer number (3936104).

Almost surely, 2^11808309 is an apocalyptic number.

It is an amenable number.

11808309 is a deficient number, since it is larger than the sum of its proper divisors (3936107).

11808309 is an equidigital number, since it uses as much as digits as its factorization.

11808309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3936106.

The product of its (nonzero) digits is 1728, while the sum is 30.

The square root of 11808309 is about 3436.3220163425. The cubic root of 11808309 is about 227.7172356425.

The spelling of 11808309 in words is "eleven million, eight hundred eight thousand, three hundred nine".