12440381897 has 2 divisors, whose sum is σ = 12440381898. Its totient is φ = 12440381896.

The previous prime is 12440381893. The next prime is 12440381903. The reversal of 12440381897 is 79818304421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11624936761 + 815445136 = 107819^2 + 28556^2 .

It is an emirp because it is prime and its reverse (79818304421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12440381897 - 2² = 12440381893 is a prime.

It is not a weakly prime, because it can be changed into another prime (12440381893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6220190948 + 6220190949.

It is an arithmetic number, because the mean of its divisors is an integer number (6220190949).

Almost surely, 2^12440381897 is an apocalyptic number.

It is an amenable number.

12440381897 is a deficient number, since it is larger than the sum of its proper divisors (1).

12440381897 is an equidigital number, since it uses as much as digits as its factorization.

12440381897 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 387072, while the sum is 47.

The spelling of 12440381897 in words is "twelve billion, four hundred forty million, three hundred eighty-one thousand, eight hundred ninety-seven".