12012543 has 10 divisors (see below), whose sum is σ = 17944784. Its totient is φ = 8008308.

The previous prime is 12012527. The next prime is 12012551. The reversal of 12012543 is 34521021.

12012543 is a `hidden beast` number, since 120 + 1 + 2 + 543 = 666.

It is not a de Polignac number, because 12012543 - 2⁴ = 12012527 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12012443) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 74071 + ... + 74232.

Almost surely, 2^12012543 is an apocalyptic number.

12012543 is a deficient number, since it is larger than the sum of its proper divisors (5932241).

12012543 is an equidigital number, since it uses as much as digits as its factorization.

12012543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148315 (or 148306 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 12012543 is about 3465.9115684045. The cubic root of 12012543 is about 229.0225882386.

Adding to 12012543 its reverse (34521021), we get a palindrome (46533564).

The spelling of 12012543 in words is "twelve million, twelve thousand, five hundred forty-three".