12543242340 has 96 divisors (see below), whose sum is σ = 36074336256. Its totient is φ = 3254517760.

The previous prime is 12543242339. The next prime is 12543242347. The reversal of 12543242340 is 4324234521.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 12543242298 and 12543242307.

It is not an unprimeable number, because it can be changed into a prime (12543242347) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 935524 + ... + 948836.

It is an arithmetic number, because the mean of its divisors is an integer number (375774336).

Almost surely, 2^12543242340 is an apocalyptic number.

12543242340 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 12543242340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18037168128).

12543242340 is an abundant number, since it is smaller than the sum of its proper divisors (23531093916).

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

12543242340 is a wasteful number, since it uses less digits than its factorization.

12543242340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13749 (or 13747 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 30.

Adding to 12543242340 its reverse (4324234521), we get a palindrome (16867476861).

The spelling of 12543242340 in words is "twelve billion, five hundred forty-three million, two hundred forty-two thousand, three hundred forty".