12165643 has 32 divisors (see below), whose sum is σ = 15805440. Its totient is φ = 9123840.

The previous prime is 12165631. The next prime is 12165661. The reversal of 12165643 is 34656121.

It is a cyclic number.

It is not a de Polignac number, because 12165643 - 2²¹ = 10068491 is a prime.

It is a super-3 number, since 3×12165643³ (a number of 22 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (12165613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 125371 + ... + 125467.

It is an arithmetic number, because the mean of its divisors is an integer number (493920).

Almost surely, 2^12165643 is an apocalyptic number.

12165643 is a deficient number, since it is larger than the sum of its proper divisors (3639797).

12165643 is a wasteful number, since it uses less digits than its factorization.

12165643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187.

The product of its digits is 4320, while the sum is 28.

The square root of 12165643 is about 3487.9281816001. The cubic root of 12165643 is about 229.9914489575.

It can be divided in two parts, 1216 and 5643, that added together give a cube (6859 = 19³).

The spelling of 12165643 in words is "twelve million, one hundred sixty-five thousand, six hundred forty-three".