12723228 has 72 divisors (see below), whose sum is σ = 38045280. Its totient is φ = 3507840.

The previous prime is 12723223. The next prime is 12723239. The reversal of 12723228 is 82232721.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12723223) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6438 + ... + 8178.

Almost surely, 2^12723228 is an apocalyptic number.

12723228 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 12723228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19022640).

12723228 is an abundant number, since it is smaller than the sum of its proper divisors (25322052).

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

12723228 is a wasteful number, since it uses less digits than its factorization.

12723228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1787 (or 1782 counting only the distinct ones).

The product of its digits is 2688, while the sum is 27.

The square root of 12723228 is about 3566.9634144465. The cubic root of 12723228 is about 233.4528086550.

Adding to 12723228 its reverse (82232721), we get a palindrome (94955949).

It can be divided in two parts, 127232 and 28, that added together give a triangular number (127260 = T₅₀₄).

The spelling of 12723228 in words is "twelve million, seven hundred twenty-three thousand, two hundred twenty-eight".