12440005 has 12 divisors (see below), whose sum is σ = 15859620. Its totient is φ = 9365504.

The previous prime is 12439979. The next prime is 12440009. The reversal of 12440005 is 50004421.

12440005 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 91809 + 12348196 = 303^2 + 3514^2 .

It is not a de Polignac number, because 12440005 - 2⁷ = 12439877 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12440009) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2860 + ... + 5749.

It is an arithmetic number, because the mean of its divisors is an integer number (1321635).

Almost surely, 2^12440005 is an apocalyptic number.

It is an amenable number.

12440005 is a deficient number, since it is larger than the sum of its proper divisors (3419615).

12440005 is an equidigital number, since it uses as much as digits as its factorization.

12440005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8648 (or 8631 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 12440005 is about 3527.0391265196. The cubic root of 12440005 is about 231.7075499045.

Adding to 12440005 its reverse (50004421), we get a palindrome (62444426).

The spelling of 12440005 in words is "twelve million, four hundred forty thousand, five".