12440321 has 4 divisors (see below), whose sum is σ = 12510000. Its totient is φ = 12370644.

The previous prime is 12440317. The next prime is 12440339. The reversal of 12440321 is 12304421.

12440321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12440321 - 2² = 12440317 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12440321.

It is not an unprimeable number, because it can be changed into a prime (12440371) 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, 34571 + ... + 34928.

It is an arithmetic number, because the mean of its divisors is an integer number (3127500).

Almost surely, 2^12440321 is an apocalyptic number.

It is an amenable number.

12440321 is a deficient number, since it is larger than the sum of its proper divisors (69679).

12440321 is an equidigital number, since it uses as much as digits as its factorization.

12440321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69678.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 12440321 is about 3527.0839230163. The cubic root of 12440321 is about 231.7095118267.

Adding to 12440321 its reverse (12304421), we get a palindrome (24744742).

The spelling of 12440321 in words is "twelve million, four hundred forty thousand, three hundred twenty-one".