12009843 has 32 divisors (see below), whose sum is σ = 19219200. Its totient is φ = 7387200.

The previous prime is 12009827. The next prime is 12009859. The reversal of 12009843 is 34890021.

It is an interprime number because it is at equal distance from previous prime (12009827) and next prime (12009859).

It is not a de Polignac number, because 12009843 - 2⁴ = 12009827 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (12009043) 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 31 ways as a sum of consecutive naturals, for example, 20748 + ... + 21318.

It is an arithmetic number, because the mean of its divisors is an integer number (600600).

Almost surely, 2^12009843 is an apocalyptic number.

12009843 is a deficient number, since it is larger than the sum of its proper divisors (7209357).

12009843 is a wasteful number, since it uses less digits than its factorization.

12009843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 640 (or 634 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 12009843 is about 3465.5220385968. The cubic root of 12009843 is about 229.0054281940.

Adding to 12009843 its reverse (34890021), we get a palindrome (46899864).

The spelling of 12009843 in words is "twelve million, nine thousand, eight hundred forty-three".