11818809 has 12 divisors (see below), whose sum is σ = 17160000. Its totient is φ = 7838424.

The previous prime is 11818801. The next prime is 11818813. The reversal of 11818809 is 90881811.

It is not a de Polignac number, because 11818809 - 2³ = 11818801 is a prime.

It is not an unprimeable number, because it can be changed into a prime (11818801) 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 11 ways as a sum of consecutive naturals, for example, 1509 + ... + 5090.

It is an arithmetic number, because the mean of its divisors is an integer number (1430000).

Almost surely, 2^11818809 is an apocalyptic number.

It is an amenable number.

11818809 is a deficient number, since it is larger than the sum of its proper divisors (5341191).

11818809 is a wasteful number, since it uses less digits than its factorization.

11818809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6804 (or 6801 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 36.

The square root of 11818809 is about 3437.8494731445. The cubic root of 11818809 is about 227.7847113671.

The spelling of 11818809 in words is "eleven million, eight hundred eighteen thousand, eight hundred nine".