12340543240 has 64 divisors (see below), whose sum is σ = 28682219520. Its totient is φ = 4773600000.

The previous prime is 12340543231. The next prime is 12340543247. The reversal of 12340543240 is 4234504321.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 12340543199 and 12340543208.

It is not an unprimeable number, because it can be changed into a prime (12340543247) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2416690 + ... + 2421790.

It is an arithmetic number, because the mean of its divisors is an integer number (448159680).

Almost surely, 2^12340543240 is an apocalyptic number.

12340543240 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 12340543240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14341109760).

12340543240 is an abundant number, since it is smaller than the sum of its proper divisors (16341676280).

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

12340543240 is a wasteful number, since it uses less digits than its factorization.

12340543240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7094 (or 7090 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 28.

The spelling of 12340543240 in words is "twelve billion, three hundred forty million, five hundred forty-three thousand, two hundred forty".