12120228 has 36 divisors (see below), whose sum is σ = 30810780. Its totient is φ = 4017216.

The previous prime is 12120223. The next prime is 12120239. The reversal of 12120228 is 82202121.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 7884864 + 4235364 = 2808^2 + 2058^2 .

It is a tau number, because it is divible by the number of its divisors (36).

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 12120228.

It is not an unprimeable number, because it can be changed into a prime (12120223) 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 11 ways as a sum of consecutive naturals, for example, 6238 + ... + 7946.

It is an arithmetic number, because the mean of its divisors is an integer number (855855).

Almost surely, 2^12120228 is an apocalyptic number.

12120228 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

12120228 is an abundant number, since it is smaller than the sum of its proper divisors (18690552).

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

12120228 is a wasteful number, since it uses less digits than its factorization.

12120228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1916 (or 1911 counting only the distinct ones).

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

The square root of 12120228 is about 3481.4117825963. The cubic root of 12120228 is about 229.7049019441.

Adding to 12120228 its reverse (82202121), we get a palindrome (94322349).

The spelling of 12120228 in words is "twelve million, one hundred twenty thousand, two hundred twenty-eight".