12440223 has 20 divisors (see below), whose sum is σ = 18678528. Its totient is φ = 8251200.

The previous prime is 12440221. The next prime is 12440227. The reversal of 12440223 is 32204421.

12440223 is a `hidden beast` number, since 1 + 2 + 440 + 223 = 666.

It is not a de Polignac number, because 12440223 - 2¹ = 12440221 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12440196 and 12440205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12440221) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 30823 + ... + 31223.

Almost surely, 2^12440223 is an apocalyptic number.

12440223 is a deficient number, since it is larger than the sum of its proper divisors (6238305).

12440223 is an equidigital number, since it uses as much as digits as its factorization.

12440223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 796 (or 787 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 12440223 is about 3527.0700304927. The cubic root of 12440223 is about 231.7089033860.

Adding to 12440223 its reverse (32204421), we get a palindrome (44644644).

The spelling of 12440223 in words is "twelve million, four hundred forty thousand, two hundred twenty-three".