12228736 has 32 divisors (see below), whose sum is σ = 26239500. Its totient is φ = 5643264.

The previous prime is 12228721. The next prime is 12228739. The reversal of 12228736 is 63782221.

It can be written as a sum of positive squares in 2 ways, for example, as 12110400 + 118336 = 3480^2 + 344^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a nialpdrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 12228698 and 12228707.

It is not an unprimeable number, because it can be changed into a prime (12228739) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2011 + ... + 5338.

Almost surely, 2^12228736 is an apocalyptic number.

12228736 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

12228736 is an abundant number, since it is smaller than the sum of its proper divisors (14010764).

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

12228736 is an equidigital number, since it uses as much as digits as its factorization.

12228736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7376 (or 7364 counting only the distinct ones).

The product of its digits is 8064, while the sum is 31.

The square root of 12228736 is about 3496.9609663249. The cubic root of 12228736 is about 230.3883546069.

The spelling of 12228736 in words is "twelve million, two hundred twenty-eight thousand, seven hundred thirty-six".