12118909 has 16 divisors (see below), whose sum is σ = 14109120. Its totient is φ = 10287360.

The previous prime is 12118891. The next prime is 12118921. The reversal of 12118909 is 90981121.

It is a cyclic number.

It is not a de Polignac number, because 12118909 - 2¹¹ = 12116861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12118969) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42682 + ... + 42964.

It is an arithmetic number, because the mean of its divisors is an integer number (881820).

Almost surely, 2^12118909 is an apocalyptic number.

It is an amenable number.

12118909 is a deficient number, since it is larger than the sum of its proper divisors (1990211).

12118909 is a wasteful number, since it uses less digits than its factorization.

12118909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 540.

The product of its (nonzero) digits is 1296, while the sum is 31.

The square root of 12118909 is about 3481.2223427986. Note that the first 3 decimals coincide. The cubic root of 12118909 is about 229.6965689942.

The spelling of 12118909 in words is "twelve million, one hundred eighteen thousand, nine hundred nine".