12445220 has 36 divisors (see below), whose sum is σ = 26829012. Its totient is φ = 4848000.

The previous prime is 12445187. The next prime is 12445249. The reversal of 12445220 is 2254421.

It is a happy number.

12445220 is nontrivially palindromic in base 11.

It can be written as a sum of positive squares in 6 ways, for example, as 556516 + 11888704 = 746^2 + 3448^2 .

It is a Smith number, since the sum of its digits (20) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 12445192 and 12445201.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 123170 + ... + 123270.

Almost surely, 2^12445220 is an apocalyptic number.

12445220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12445220 is an abundant number, since it is smaller than the sum of its proper divisors (14383792).

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

12445220 is a wasteful number, since it uses less digits than its factorization.

12445220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272 (or 169 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 12445220 is about 3527.7783377077. The cubic root of 12445220 is about 231.7399235801.

Adding to 12445220 its reverse (2254421), we get a palindrome (14699641).

The spelling of 12445220 in words is "twelve million, four hundred forty-five thousand, two hundred twenty".