12440513 has 2 divisors, whose sum is σ = 12440514. Its totient is φ = 12440512.

The previous prime is 12440489. The next prime is 12440521. The reversal of 12440513 is 31504421.

12440513 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12439729 + 784 = 3527^2 + 28^2 .

It is a cyclic number.

It is not a de Polignac number, because 12440513 - 2²⁰ = 11391937 is a prime.

It is not a weakly prime, because it can be changed into another prime (12442513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6220256 + 6220257.

It is an arithmetic number, because the mean of its divisors is an integer number (6220257).

Almost surely, 2^12440513 is an apocalyptic number.

It is an amenable number.

12440513 is a deficient number, since it is larger than the sum of its proper divisors (1).

12440513 is an equidigital number, since it uses as much as digits as its factorization.

12440513 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 12440513 is about 3527.1111408630. Note that the first 4 decimals coincide. The cubic root of 12440513 is about 231.7107038645.

Adding to 12440513 its reverse (31504421), we get a palindrome (43944934).

The spelling of 12440513 in words is "twelve million, four hundred forty thousand, five hundred thirteen".