12128019 has 4 divisors (see below), whose sum is σ = 16170696. Its totient is φ = 8085344.

The previous prime is 12128009. The next prime is 12128027. The reversal of 12128019 is 91082121.

12128019 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 12128019 - 2²⁰ = 11079443 is a prime.

It is a super-2 number, since 2×12128019² = 294177689728722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12128019.

It is not an unprimeable number, because it can be changed into a prime (12128009) 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, 2021334 + ... + 2021339.

It is an arithmetic number, because the mean of its divisors is an integer number (4042674).

Almost surely, 2^12128019 is an apocalyptic number.

12128019 is a deficient number, since it is larger than the sum of its proper divisors (4042677).

12128019 is an equidigital number, since it uses as much as digits as its factorization.

12128019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4042676.

The product of its (nonzero) digits is 288, while the sum is 24.

The square root of 12128019 is about 3482.5305454511. The cubic root of 12128019 is about 229.7541102473.

The spelling of 12128019 in words is "twelve million, one hundred twenty-eight thousand, nineteen".