12128135 has 4 divisors (see below), whose sum is σ = 14553768. Its totient is φ = 9702504.

The previous prime is 12128131. The next prime is 12128141. The reversal of 12128135 is 53182121.

It is a happy number.

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 12128135 - 2² = 12128131 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12128135.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12128131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1212809 + ... + 1212818.

It is an arithmetic number, because the mean of its divisors is an integer number (3638442).

Almost surely, 2^12128135 is an apocalyptic number.

12128135 is a deficient number, since it is larger than the sum of its proper divisors (2425633).

12128135 is an equidigital number, since it uses as much as digits as its factorization.

12128135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2425632.

The product of its digits is 480, while the sum is 23.

The square root of 12128135 is about 3482.5471999673. The cubic root of 12128135 is about 229.7548427492.

The spelling of 12128135 in words is "twelve million, one hundred twenty-eight thousand, one hundred thirty-five".