12636224 has 14 divisors (see below), whose sum is σ = 25075134. Its totient is φ = 6318080.

The previous prime is 12636209. The next prime is 12636229. The reversal of 12636224 is 42263621.

It can be written as a sum of positive squares in only one way, i.e., 10445824 + 2190400 = 3232^2 + 1480^2 .

It is a junction number, because it is equal to n+sod(n) for n = 12636193 and 12636202.

It is not an unprimeable number, because it can be changed into a prime (12636229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98657 + ... + 98784.

It is an arithmetic number, because the mean of its divisors is an integer number (1791081).

Almost surely, 2^12636224 is an apocalyptic number.

It is an amenable number.

12636224 is a deficient number, since it is larger than the sum of its proper divisors (12438910).

12636224 is an equidigital number, since it uses as much as digits as its factorization.

12636224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197453 (or 197443 counting only the distinct ones).

The product of its digits is 3456, while the sum is 26.

The square root of 12636224 is about 3554.7466857710. The cubic root of 12636224 is about 232.9194586145.

Adding to 12636224 its reverse (42263621), we get a palindrome (54899845).

The spelling of 12636224 in words is "twelve million, six hundred thirty-six thousand, two hundred twenty-four".