12428891 has 2 divisors, whose sum is σ = 12428892. Its totient is φ = 12428890.

The previous prime is 12428837. The next prime is 12428903. The reversal of 12428891 is 19882421.

12428891 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12428891 - 2⁶ = 12428827 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12428191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6214445 + 6214446.

It is an arithmetic number, because the mean of its divisors is an integer number (6214446).

Almost surely, 2^12428891 is an apocalyptic number.

12428891 is a deficient number, since it is larger than the sum of its proper divisors (1).

12428891 is an equidigital number, since it uses as much as digits as its factorization.

12428891 is an odious number, because the sum of its binary digits is odd.

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

The square root of 12428891 is about 3525.4632319739. The cubic root of 12428891 is about 231.6385262187.

The spelling of 12428891 in words is "twelve million, four hundred twenty-eight thousand, eight hundred ninety-one".