12128929 has 2 divisors, whose sum is σ = 12128930. Its totient is φ = 12128928.

The previous prime is 12128923. The next prime is 12128947. The reversal of 12128929 is 92982121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11235904 + 893025 = 3352^2 + 945^2 .

It is a cyclic number.

It is not a de Polignac number, because 12128929 - 2⁷ = 12128801 is a prime.

It is a super-2 number, since 2×12128929² = 294221837374082, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12128894 and 12128903.

It is not a weakly prime, because it can be changed into another prime (12128923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6064464 + 6064465.

It is an arithmetic number, because the mean of its divisors is an integer number (6064465).

Almost surely, 2^12128929 is an apocalyptic number.

It is an amenable number.

12128929 is a deficient number, since it is larger than the sum of its proper divisors (1).

12128929 is an equidigital number, since it uses as much as digits as its factorization.

12128929 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5184, while the sum is 34.

The square root of 12128929 is about 3482.6611951208. The cubic root of 12128929 is about 229.7598564732.

The spelling of 12128929 in words is "twelve million, one hundred twenty-eight thousand, nine hundred twenty-nine".