12129689 has 16 divisors (see below), whose sum is σ = 14348544. Its totient is φ = 10108800.

The previous prime is 12129661. The next prime is 12129697. The reversal of 12129689 is 98692121.

12129689 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12129689 - 2²⁰ = 11081113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12129659) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38597 + ... + 38909.

It is an arithmetic number, because the mean of its divisors is an integer number (896784).

Almost surely, 2^12129689 is an apocalyptic number.

It is an amenable number.

12129689 is a deficient number, since it is larger than the sum of its proper divisors (2218855).

12129689 is a wasteful number, since it uses less digits than its factorization.

12129689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 608.

The product of its digits is 15552, while the sum is 38.

The square root of 12129689 is about 3482.7703053747. The cubic root of 12129689 is about 229.7646552988.

It can be divided in two parts, 1212 and 9689, that added together give a palindrome (10901).

The spelling of 12129689 in words is "twelve million, one hundred twenty-nine thousand, six hundred eighty-nine".