12005543 has 4 divisors (see below), whose sum is σ = 13096968. Its totient is φ = 10914120.

The previous prime is 12005537. The next prime is 12005597. The reversal of 12005543 is 34550021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34550021 = 11 ⋅3140911.

It is a cyclic number.

It is not a de Polignac number, because 12005543 - 2⁴ = 12005527 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 (12005243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 545696 + ... + 545717.

It is an arithmetic number, because the mean of its divisors is an integer number (3274242).

Almost surely, 2^12005543 is an apocalyptic number.

12005543 is a deficient number, since it is larger than the sum of its proper divisors (1091425).

12005543 is a wasteful number, since it uses less digits than its factorization.

12005543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1091424.

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 12005543 is about 3464.9015859040. The cubic root of 12005543 is about 228.9780939236.

Adding to 12005543 its reverse (34550021), we get a palindrome (46555564).

The spelling of 12005543 in words is "twelve million, five thousand, five hundred forty-three".