12400543 has 2 divisors, whose sum is σ = 12400544. Its totient is φ = 12400542.

The previous prime is 12400541. The next prime is 12400547. The reversal of 12400543 is 34500421.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 12400543 - 2¹ = 12400541 is a prime.

Together with 12400541, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 12400543.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12400541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6200271 + 6200272.

It is an arithmetic number, because the mean of its divisors is an integer number (6200272).

Almost surely, 2^12400543 is an apocalyptic number.

12400543 is a deficient number, since it is larger than the sum of its proper divisors (1).

12400543 is an equidigital number, since it uses as much as digits as its factorization.

12400543 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 12400543 is about 3521.4404723068. The cubic root of 12400543 is about 231.4622839567.

Adding to 12400543 its reverse (34500421), we get a palindrome (46900964).

The spelling of 12400543 in words is "twelve million, four hundred thousand, five hundred forty-three".