12129605 has 4 divisors (see below), whose sum is σ = 14555532. Its totient is φ = 9703680.

The previous prime is 12129583. The next prime is 12129617. The reversal of 12129605 is 50692121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7873636 + 4255969 = 2806^2 + 2063^2 .

It is not a de Polignac number, because 12129605 - 2¹⁴ = 12113221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1212956 + ... + 1212965.

It is an arithmetic number, because the mean of its divisors is an integer number (3638883).

Almost surely, 2^12129605 is an apocalyptic number.

It is an amenable number.

12129605 is a deficient number, since it is larger than the sum of its proper divisors (2425927).

12129605 is an equidigital number, since it uses as much as digits as its factorization.

12129605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2425926.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 12129605 is about 3482.7582459884. The cubic root of 12129605 is about 229.7641249121.

The spelling of 12129605 in words is "twelve million, one hundred twenty-nine thousand, six hundred five".