12129269 has 4 divisors (see below), whose sum is σ = 12137580. Its totient is φ = 12120960.

The previous prime is 12129259. The next prime is 12129283. The reversal of 12129269 is 96292121.

12129269 is digitally balanced in base 3, 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, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 4566769 + 7562500 = 2137^2 + 2750^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12129269 is a prime.

It is a super-2 number, since 2×12129269² = 294238332948722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12129259) 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, 1322 + ... + 5099.

It is an arithmetic number, because the mean of its divisors is an integer number (3034395).

Almost surely, 2^12129269 is an apocalyptic number.

It is an amenable number.

12129269 is a deficient number, since it is larger than the sum of its proper divisors (8311).

12129269 is an equidigital number, since it uses as much as digits as its factorization.

12129269 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8310.

The product of its digits is 3888, while the sum is 32.

The square root of 12129269 is about 3482.7100080254. The cubic root of 12129269 is about 229.7620033410.

The spelling of 12129269 in words is "twelve million, one hundred twenty-nine thousand, two hundred sixty-nine".