12189823 has 4 divisors (see below), whose sum is σ = 12203568. Its totient is φ = 12176080.

The previous prime is 12189817. The next prime is 12189847. The reversal of 12189823 is 32898121.

12189823 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 12189823 - 2²¹ = 10092671 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12189803) 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, 5443 + ... + 7348.

It is an arithmetic number, because the mean of its divisors is an integer number (3050892).

Almost surely, 2^12189823 is an apocalyptic number.

12189823 is a deficient number, since it is larger than the sum of its proper divisors (13745).

12189823 is an equidigital number, since it uses as much as digits as its factorization.

12189823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13744.

The product of its digits is 6912, while the sum is 34.

The square root of 12189823 is about 3491.3927020603. The cubic root of 12189823 is about 230.1437223964.

The spelling of 12189823 in words is "twelve million, one hundred eighty-nine thousand, eight hundred twenty-three".