12000645 has 12 divisors (see below), whose sum is σ = 20801196. Its totient is φ = 6400320.

The previous prime is 12000643. The next prime is 12000661. The reversal of 12000645 is 54600021.

It is a happy number.

12000645 is a `hidden beast` number, since 1 + 20 + 0 + 0 + 645 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 6081156 + 5919489 = 2466^2 + 2433^2 .

It is not a de Polignac number, because 12000645 - 2¹ = 12000643 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12000643) 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 11 ways as a sum of consecutive naturals, for example, 133296 + ... + 133385.

It is an arithmetic number, because the mean of its divisors is an integer number (1733433).

Almost surely, 2^12000645 is an apocalyptic number.

12000645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12000645 is a deficient number, since it is larger than the sum of its proper divisors (8800551).

12000645 is a wasteful number, since it uses less digits than its factorization.

12000645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266692 (or 266689 counting only the distinct ones).

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

The square root of 12000645 is about 3464.1947116177. The cubic root of 12000645 is about 228.9469503299.

Adding to 12000645 its reverse (54600021), we get a palindrome (66600666).

The spelling of 12000645 in words is "twelve million, six hundred forty-five", and thus it is an aban number.