12201228 has 108 divisors (see below), whose sum is σ = 35508928. Its totient is φ = 3507840.

The previous prime is 12201193. The next prime is 12201229. The reversal of 12201228 is 82210221.

It is a happy number.

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 12201228.

It is not an unprimeable number, because it can be changed into a prime (12201229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 393573 + ... + 393603.

Almost surely, 2^12201228 is an apocalyptic number.

12201228 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12201228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17754464).

12201228 is an abundant number, since it is smaller than the sum of its proper divisors (23307700).

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

12201228 is a wasteful number, since it uses less digits than its factorization.

12201228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112 (or 78 counting only the distinct ones).

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

The square root of 12201228 is about 3493.0256225799. The cubic root of 12201228 is about 230.2154754475.

Adding to 12201228 its reverse (82210221), we get a palindrome (94411449).

The spelling of 12201228 in words is "twelve million, two hundred one thousand, two hundred twenty-eight".