12218018 has 4 divisors (see below), whose sum is σ = 18327030. Its totient is φ = 6109008.

The previous prime is 12217993. The next prime is 12218027. The reversal of 12218018 is 81081221.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81081221 = 13 ⋅6237017.

It can be written as a sum of positive squares in only one way, i.e., 11377129 + 840889 = 3373^2 + 917^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12217984 and 12218002.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 3054503 + ... + 3054506.

Almost surely, 2^12218018 is an apocalyptic number.

12218018 is a deficient number, since it is larger than the sum of its proper divisors (6109012).

12218018 is an equidigital number, since it uses as much as digits as its factorization.

12218018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6109011.

The product of its (nonzero) digits is 256, while the sum is 23.

The square root of 12218018 is about 3495.4281568929. The cubic root of 12218018 is about 230.3210261942.

Adding to 12218018 its reverse (81081221), we get a palindrome (93299239).

The spelling of 12218018 in words is "twelve million, two hundred eighteen thousand, eighteen".