12440009 has 2 divisors, whose sum is σ = 12440010. Its totient is φ = 12440008.

The previous prime is 12439979. The next prime is 12440017. The reversal of 12440009 is 90004421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6775609 + 5664400 = 2603^2 + 2380^2 .

It is a cyclic number.

It is not a de Polignac number, because 12440009 - 2²⁰ = 11391433 is a prime.

It is a Chen prime.

It is a plaindrome in base 15.

It is not a weakly prime, because it can be changed into another prime (12440059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6220004 + 6220005.

It is an arithmetic number, because the mean of its divisors is an integer number (6220005).

Almost surely, 2^12440009 is an apocalyptic number.

It is an amenable number.

12440009 is a deficient number, since it is larger than the sum of its proper divisors (1).

12440009 is an equidigital number, since it uses as much as digits as its factorization.

12440009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 12440009 is about 3527.0396935674. The cubic root of 12440009 is about 231.7075747392.

The spelling of 12440009 in words is "twelve million, four hundred forty thousand, nine".