12222018 has 24 divisors (see below), whose sum is σ = 27128556. Its totient is φ = 3974400.

The previous prime is 12222013. The next prime is 12222047. The reversal of 12222018 is 81022221.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 8661249 + 3560769 = 2943^2 + 1887^2 .

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12222013) 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 11 ways as a sum of consecutive naturals, for example, 7543 + ... + 9018.

Almost surely, 2^12222018 is an apocalyptic number.

12222018 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

12222018 is an abundant number, since it is smaller than the sum of its proper divisors (14906538).

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

12222018 is a wasteful number, since it uses less digits than its factorization.

12222018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16610 (or 16607 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 12222018 is about 3496.0002860412. Note that the first 3 decimals coincide. The cubic root of 12222018 is about 230.3461580278.

Adding to 12222018 its reverse (81022221), we get a palindrome (93244239).

It can be divided in two parts, 1222 and 2018, that added together give a triangular number (3240 = T₈₀).

The spelling of 12222018 in words is "twelve million, two hundred twenty-two thousand, eighteen".