12440389873 has 2 divisors, whose sum is σ = 12440389874. Its totient is φ = 12440389872.

The previous prime is 12440389847. The next prime is 12440389879. The reversal of 12440389873 is 37898304421.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12105060529 + 335329344 = 110023^2 + 18312^2 .

It is an emirp because it is prime and its reverse (37898304421) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12440389873 is a prime.

It is a super-2 number, since 2×12440389873² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (12440389879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6220194936 + 6220194937.

It is an arithmetic number, because the mean of its divisors is an integer number (6220194937).

Almost surely, 2^12440389873 is an apocalyptic number.

It is an amenable number.

12440389873 is a deficient number, since it is larger than the sum of its proper divisors (1).

12440389873 is an equidigital number, since it uses as much as digits as its factorization.

12440389873 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1161216, while the sum is 49.

The spelling of 12440389873 in words is "twelve billion, four hundred forty million, three hundred eighty-nine thousand, eight hundred seventy-three".