12218178 has 64 divisors (see below), whose sum is σ = 29998080. Its totient is φ = 3240000.

The previous prime is 12218153. The next prime is 12218179. The reversal of 12218178 is 87181221.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (12218179) 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, 48553 + ... + 48803.

It is an arithmetic number, because the mean of its divisors is an integer number (468720).

Almost surely, 2^12218178 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12218178, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14999040).

12218178 is an abundant number, since it is smaller than the sum of its proper divisors (17779902).

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

12218178 is a wasteful number, since it uses less digits than its factorization.

12218178 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343.

The product of its digits is 1792, while the sum is 30.

The square root of 12218178 is about 3495.4510438569. The cubic root of 12218178 is about 230.3220315729.

Adding to 12218178 its reverse (87181221), we get a palindrome (99399399).

The spelling of 12218178 in words is "twelve million, two hundred eighteen thousand, one hundred seventy-eight".