12840543 has 12 divisors (see below), whose sum is σ = 18590520. Its totient is φ = 8540496.

The previous prime is 12840539. The next prime is 12840547. The reversal of 12840543 is 34504821.

It is an interprime number because it is at equal distance from previous prime (12840539) and next prime (12840547).

It is not a de Polignac number, because 12840543 - 2² = 12840539 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12840547) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3180 + ... + 5982.

It is an arithmetic number, because the mean of its divisors is an integer number (1549210).

Almost surely, 2^12840543 is an apocalyptic number.

12840543 is a deficient number, since it is larger than the sum of its proper divisors (5749977).

12840543 is a wasteful number, since it uses less digits than its factorization.

12840543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3318 (or 3315 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 12840543 is about 3583.3703408942. The cubic root of 12840543 is about 234.1681346958.

The spelling of 12840543 in words is "twelve million, eight hundred forty thousand, five hundred forty-three".