12210228 has 18 divisors (see below), whose sum is σ = 30864834. Its totient is φ = 4070064.

The previous prime is 12210223. The next prime is 12210229. The reversal of 12210228 is 82201221.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 10419984 + 1790244 = 3228^2 + 1338^2 .

It is a tau number, because it is divible by the number of its divisors (18).

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 12210228.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12210221) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 169551 + ... + 169622.

It is an arithmetic number, because the mean of its divisors is an integer number (1714713).

Almost surely, 2^12210228 is an apocalyptic number.

12210228 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

12210228 is an abundant number, since it is smaller than the sum of its proper divisors (18654606).

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

12210228 is a wasteful number, since it uses less digits than its factorization.

12210228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339183 (or 339178 counting only the distinct ones).

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

The square root of 12210228 is about 3494.3136665159. The cubic root of 12210228 is about 230.2720662007.

Adding to 12210228 its reverse (82201221), we get a palindrome (94411449).

The spelling of 12210228 in words is "twelve million, two hundred ten thousand, two hundred twenty-eight".