12281228 has 24 divisors (see below), whose sum is σ = 22017072. Its totient is φ = 5992704.

The previous prime is 12281221. The next prime is 12281237. The reversal of 12281228 is 82218221.

It is a super-2 number, since 2×12281228² = 301657122375968, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12281197 and 12281206.

It is not an unprimeable number, because it can be changed into a prime (12281221) 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 7 ways as a sum of consecutive naturals, for example, 39851 + ... + 40157.

It is an arithmetic number, because the mean of its divisors is an integer number (917378).

Almost surely, 2^12281228 is an apocalyptic number.

It is an amenable number.

12281228 is a deficient number, since it is larger than the sum of its proper divisors (9735844).

12281228 is a wasteful number, since it uses less digits than its factorization.

12281228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 521 (or 519 counting only the distinct ones).

The product of its digits is 1024, while the sum is 26.

The square root of 12281228 is about 3504.4583033616. The cubic root of 12281228 is about 230.7175323393.

Adding to 12281228 its reverse (82218221), we get a palindrome (94499449).

The spelling of 12281228 in words is "twelve million, two hundred eighty-one thousand, two hundred twenty-eight".