12128849 has 4 divisors (see below), whose sum is σ = 12142080. Its totient is φ = 12115620.

The previous prime is 12128827. The next prime is 12128869. The reversal of 12128849 is 94882121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 94882121 = 131 ⋅724291.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12128849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12128819) 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, 5129 + ... + 7110.

It is an arithmetic number, because the mean of its divisors is an integer number (3035520).

Almost surely, 2^12128849 is an apocalyptic number.

It is an amenable number.

12128849 is a deficient number, since it is larger than the sum of its proper divisors (13231).

12128849 is an equidigital number, since it uses as much as digits as its factorization.

12128849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13230.

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

The square root of 12128849 is about 3482.6497096320. The cubic root of 12128849 is about 229.7593513220.

The spelling of 12128849 in words is "twelve million, one hundred twenty-eight thousand, eight hundred forty-nine".