12240399989 has 2 divisors, whose sum is σ = 12240399990. Its totient is φ = 12240399988.

The previous prime is 12240399949. The next prime is 12240400031. The reversal of 12240399989 is 98999304221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7133153764 + 5107246225 = 84458^2 + 71465^2 .

It is an emirp because it is prime and its reverse (98999304221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12240399989 - 2⁸ = 12240399733 is a prime.

It is a super-2 number, since 2×12240399989² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12240399949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6120199994 + 6120199995.

It is an arithmetic number, because the mean of its divisors is an integer number (6120199995).

Almost surely, 2^12240399989 is an apocalyptic number.

It is an amenable number.

12240399989 is a deficient number, since it is larger than the sum of its proper divisors (1).

12240399989 is an equidigital number, since it uses as much as digits as its factorization.

12240399989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2519424, while the sum is 56.

The spelling of 12240399989 in words is "twelve billion, two hundred forty million, three hundred ninety-nine thousand, nine hundred eighty-nine".