12129645 has 48 divisors (see below), whose sum is σ = 21986496. Its totient is φ = 5702400.

The previous prime is 12129617. The next prime is 12129659. The reversal of 12129645 is 54692121.

12129645 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12129645 - 2¹⁰ = 12128621 is a prime.

It is a super-3 number, since 3×12129645³ (a number of 22 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 74334 + ... + 74496.

It is an arithmetic number, because the mean of its divisors is an integer number (458052).

Almost surely, 2^12129645 is an apocalyptic number.

12129645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12129645 is a deficient number, since it is larger than the sum of its proper divisors (9856851).

12129645 is a wasteful number, since it uses less digits than its factorization.

12129645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234 (or 223 counting only the distinct ones).

The product of its digits is 4320, while the sum is 30.

The square root of 12129645 is about 3482.7639885585. The cubic root of 12129645 is about 229.7643774775.

The spelling of 12129645 in words is "twelve million, one hundred twenty-nine thousand, six hundred forty-five".