12966543 has 6 divisors (see below), whose sum is σ = 18729464. Its totient is φ = 8644356.

The previous prime is 12966497. The next prime is 12966557. The reversal of 12966543 is 34566921.

It is a happy number.

It is not a de Polignac number, because 12966543 - 2¹⁴ = 12950159 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12966498 and 12966507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12966593) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 720355 + ... + 720372.

Almost surely, 2^12966543 is an apocalyptic number.

12966543 is a deficient number, since it is larger than the sum of its proper divisors (5762921).

12966543 is a wasteful number, since it uses less digits than its factorization.

12966543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1440733 (or 1440730 counting only the distinct ones).

The product of its digits is 38880, while the sum is 36.

The square root of 12966543 is about 3600.9086353308. The cubic root of 12966543 is about 234.9315811083.

The spelling of 12966543 in words is "twelve million, nine hundred sixty-six thousand, five hundred forty-three".