12543218 has 4 divisors (see below), whose sum is σ = 18814830. Its totient is φ = 6271608.

The previous prime is 12543199. The next prime is 12543233. The reversal of 12543218 is 81234521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81234521 = 1987 ⋅40883.

It can be written as a sum of positive squares in only one way, i.e., 7006609 + 5536609 = 2647^2 + 2353^2 .

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3135803 + ... + 3135806.

Almost surely, 2^12543218 is an apocalyptic number.

12543218 is a deficient number, since it is larger than the sum of its proper divisors (6271612).

12543218 is an equidigital number, since it uses as much as digits as its factorization.

12543218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6271611.

The product of its digits is 1920, while the sum is 26.

The square root of 12543218 is about 3541.6405802961. The cubic root of 12543218 is about 232.3466009360.

Adding to 12543218 its reverse (81234521), we get a palindrome (93777739).

The spelling of 12543218 in words is "twelve million, five hundred forty-three thousand, two hundred eighteen".