12013218 has 64 divisors (see below), whose sum is σ = 31069440. Its totient is φ = 3369600.

The previous prime is 12013207. The next prime is 12013219. The reversal of 12013218 is 81231021.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a self number, because there is not a number n which added to its sum of digits gives 12013218.

It is not an unprimeable number, because it can be changed into a prime (12013219) 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 31 ways as a sum of consecutive naturals, for example, 22798 + ... + 23318.

It is an arithmetic number, because the mean of its divisors is an integer number (485460).

Almost surely, 2^12013218 is an apocalyptic number.

12013218 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 12013218, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15534720).

12013218 is an abundant number, since it is smaller than the sum of its proper divisors (19056222).

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

12013218 is a wasteful number, since it uses less digits than its factorization.

12013218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 600 (or 594 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 12013218 is about 3466.0089440162. The cubic root of 12013218 is about 229.0268778480.

Adding to 12013218 its reverse (81231021), we get a palindrome (93244239).

The spelling of 12013218 in words is "twelve million, thirteen thousand, two hundred eighteen".