12428111 has 4 divisors (see below), whose sum is σ = 12487224. Its totient is φ = 12369000.

The previous prime is 12428089. The next prime is 12428113. The reversal of 12428111 is 11182421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11182421 = 1931 ⋅5791.

It is a cyclic number.

It is not a de Polignac number, because 12428111 - 2⁶ = 12428047 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 (12428113) 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, 29240 + ... + 29661.

It is an arithmetic number, because the mean of its divisors is an integer number (3121806).

Almost surely, 2^12428111 is an apocalyptic number.

12428111 is a deficient number, since it is larger than the sum of its proper divisors (59113).

12428111 is an equidigital number, since it uses as much as digits as its factorization.

12428111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59112.

The product of its digits is 128, while the sum is 20.

The square root of 12428111 is about 3525.3526064778. The cubic root of 12428111 is about 231.6336804704.

The spelling of 12428111 in words is "twelve million, four hundred twenty-eight thousand, one hundred eleven".