12544440239 has 2 divisors, whose sum is σ = 12544440240. Its totient is φ = 12544440238.

The previous prime is 12544440197. The next prime is 12544440277. The reversal of 12544440239 is 93204444521.

It is a happy number.

It is an a-pointer prime, because the next prime (12544440277) can be obtained adding 12544440239 to its sum of digits (38).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12544440239 - 2⁸ = 12544439983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12544440289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6272220119 + 6272220120.

It is an arithmetic number, because the mean of its divisors is an integer number (6272220120).

Almost surely, 2^12544440239 is an apocalyptic number.

12544440239 is a deficient number, since it is larger than the sum of its proper divisors (1).

12544440239 is an equidigital number, since it uses as much as digits as its factorization.

12544440239 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 138240, while the sum is 38.

The spelling of 12544440239 in words is "twelve billion, five hundred forty-four million, four hundred forty thousand, two hundred thirty-nine".