12428189 has 4 divisors (see below), whose sum is σ = 12764124. Its totient is φ = 12092256.

The previous prime is 12428137. The next prime is 12428191. The reversal of 12428189 is 98182421.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5484964 + 6943225 = 2342^2 + 2635^2 .

It is a cyclic number.

It is not a de Polignac number, because 12428189 - 2¹⁶ = 12362653 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 (12428089) 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, 167912 + ... + 167985.

It is an arithmetic number, because the mean of its divisors is an integer number (3191031).

Almost surely, 2^12428189 is an apocalyptic number.

It is an amenable number.

12428189 is a deficient number, since it is larger than the sum of its proper divisors (335935).

12428189 is an equidigital number, since it uses as much as digits as its factorization.

12428189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335934.

The product of its digits is 9216, while the sum is 35.

The square root of 12428189 is about 3525.3636691836. The cubic root of 12428189 is about 231.6341650544.

The spelling of 12428189 in words is "twelve million, four hundred twenty-eight thousand, one hundred eighty-nine".