12225640 has 64 divisors (see below), whose sum is σ = 32140800. Its totient is φ = 4098048.

The previous prime is 12225613. The next prime is 12225641. The reversal of 12225640 is 4652221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12225641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12696 + ... + 13624.

It is an arithmetic number, because the mean of its divisors is an integer number (502200).

Almost surely, 2^12225640 is an apocalyptic number.

12225640 is a gapful number since it is divisible by the number (10) 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 12225640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16070400).

12225640 is an abundant number, since it is smaller than the sum of its proper divisors (19915160).

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

12225640 is a wasteful number, since it uses less digits than its factorization.

12225640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 994 (or 990 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 12225640 is about 3496.5182682205. The cubic root of 12225640 is about 230.3689101729.

Adding to 12225640 its reverse (4652221), we get a palindrome (16877861).

The spelling of 12225640 in words is "twelve million, two hundred twenty-five thousand, six hundred forty".