12145643 has 4 divisors (see below), whose sum is σ = 12212928. Its totient is φ = 12078360.

The previous prime is 12145607. The next prime is 12145669. The reversal of 12145643 is 34654121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12145643 - 2⁸ = 12145387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12145673) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33371 + ... + 33732.

It is an arithmetic number, because the mean of its divisors is an integer number (3053232).

Almost surely, 2^12145643 is an apocalyptic number.

12145643 is a deficient number, since it is larger than the sum of its proper divisors (67285).

12145643 is an equidigital number, since it uses as much as digits as its factorization.

12145643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67284.

The product of its digits is 2880, while the sum is 26.

The square root of 12145643 is about 3485.0599707896. The cubic root of 12145643 is about 229.8653465133.

Adding to 12145643 its reverse (34654121), we get a palindrome (46799764).

The spelling of 12145643 in words is "twelve million, one hundred forty-five thousand, six hundred forty-three".