12215228 has 24 divisors (see below), whose sum is σ = 21978432. Its totient is φ = 5937984.

The previous prime is 12215221. The next prime is 12215237. The reversal of 12215228 is 82251221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12215221) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33101 + ... + 33467.

It is an arithmetic number, because the mean of its divisors is an integer number (915768).

Almost surely, 2^12215228 is an apocalyptic number.

It is an amenable number.

12215228 is a deficient number, since it is larger than the sum of its proper divisors (9763204).

12215228 is a wasteful number, since it uses less digits than its factorization.

12215228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 581 (or 579 counting only the distinct ones).

The product of its digits is 640, while the sum is 23.

The square root of 12215228 is about 3495.0290413672. The cubic root of 12215228 is about 230.3034934929.

Adding to 12215228 its reverse (82251221), we get a palindrome (94466449).

The spelling of 12215228 in words is "twelve million, two hundred fifteen thousand, two hundred twenty-eight".