12109218 has 16 divisors (see below), whose sum is σ = 26420256. Its totient is φ = 3669440.

The previous prime is 12109217. The next prime is 12109231. The reversal of 12109218 is 81290121.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (12109217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91671 + ... + 91802.

It is an arithmetic number, because the mean of its divisors is an integer number (1651266).

Almost surely, 2^12109218 is an apocalyptic number.

12109218 is an abundant number, since it is smaller than the sum of its proper divisors (14311038).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12109218 is a wasteful number, since it uses less digits than its factorization.

12109218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 183489.

The product of its (nonzero) digits is 288, while the sum is 24.

The square root of 12109218 is about 3479.8301682697. The cubic root of 12109218 is about 229.6353263235.

Adding to 12109218 its reverse (81290121), we get a palindrome (93399339).

The spelling of 12109218 in words is "twelve million, one hundred nine thousand, two hundred eighteen".