12440402243440 has 160 divisors (see below), whose sum is σ = 30197842589376. Its totient is φ = 4762688716800.

The previous prime is 12440402243431. The next prime is 12440402243441. The reversal of 12440402243440 is 4434220404421.

It is a junction number, because it is equal to n+sod(n) for n = 12440402243396 and 12440402243405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12440402243441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 33517114 + ... + 33886246.

Almost surely, 2^{12440402243440} is an apocalyptic number.

12440402243440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12440402243440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15098921294688).

12440402243440 is an abundant number, since it is smaller than the sum of its proper divisors (17757440345936).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12440402243440 is a wasteful number, since it uses less digits than its factorization.

12440402243440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 369387 (or 369381 counting only the distinct ones).

The product of its (nonzero) digits is 98304, while the sum is 34.

Adding to 12440402243440 its reverse (4434220404421), we get a palindrome (16874622647861).

The spelling of 12440402243440 in words is "twelve trillion, four hundred forty billion, four hundred two million, two hundred forty-three thousand, four hundred forty".