12129505 has 8 divisors (see below), whose sum is σ = 15321600. Its totient is φ = 9192816.

The previous prime is 12129499. The next prime is 12129521. The reversal of 12129505 is 50592121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12129505 - 2³ = 12129497 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12129505.

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 7 ways as a sum of consecutive naturals, for example, 63745 + ... + 63934.

It is an arithmetic number, because the mean of its divisors is an integer number (1915200).

Almost surely, 2^12129505 is an apocalyptic number.

It is an amenable number.

12129505 is a deficient number, since it is larger than the sum of its proper divisors (3192095).

12129505 is a wasteful number, since it uses less digits than its factorization.

12129505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127703.

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 12129505 is about 3482.7438895216. The cubic root of 12129505 is about 229.7634934962.

The spelling of 12129505 in words is "twelve million, one hundred twenty-nine thousand, five hundred five".