12440502369 has 51 divisors (see below), whose sum is σ = 19823014867. Its totient is φ = 7805805408.

The previous prime is 12440502343. The next prime is 12440502401. The reversal of 12440502369 is 96320504421.

It is a happy number.

The square root of 12440502369 is 111537.

It is a perfect power (a square), and thus also a powerful number.

12440502369 is a `hidden beast` number, since 1 + 244 + 0 + 50 + 2 + 369 = 666.

It can be written as a sum of positive squares in only one way, i.e., 9685512225 + 2754990144 = 98415^2 + 52488^2 .

It is a tau number, because it is divible by the number of its divisors (51).

It is not a de Polignac number, because 12440502369 - 2⁷ = 12440502241 is a prime.

It is a super-2 number, since 2×12440502369² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12440502469) by changing a digit.

It is a polite number, since it can be written in 50 ways as a sum of consecutive naturals, for example, 731794249 + ... + 731794265.

Almost surely, 2^12440502369 is an apocalyptic number.

12440502369 is the 111537-th square number.

12440502369 is the 55769-th centered octagonal number.

It is an amenable number.

12440502369 is a deficient number, since it is larger than the sum of its proper divisors (7382512498).

12440502369 is an frugal number, since it uses more digits than its factorization.

12440502369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82 (or 20 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

Multiplying 12440502369 by its sum of digits (36), we get a square (447858085284 = 669222²).

The spelling of 12440502369 in words is "twelve billion, four hundred forty million, five hundred two thousand, three hundred sixty-nine".