12005643 has 16 divisors (see below), whose sum is σ = 17642240. Its totient is φ = 7215264.

The previous prime is 12005641. The next prime is 12005659. The reversal of 12005643 is 34650021.

It is a happy number.

12005643 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12005643 - 2¹ = 12005641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12005641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1903 + ... + 5256.

It is an arithmetic number, because the mean of its divisors is an integer number (1102640).

Almost surely, 2^12005643 is an apocalyptic number.

12005643 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

12005643 is a deficient number, since it is larger than the sum of its proper divisors (5636597).

12005643 is a wasteful number, since it uses less digits than its factorization.

12005643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7218.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 12005643 is about 3464.9160162982. The cubic root of 12005643 is about 228.9787296784.

Adding to 12005643 its reverse (34650021), we get a palindrome (46655664).

The spelling of 12005643 in words is "twelve million, five thousand, six hundred forty-three".