12005129 has 4 divisors (see below), whose sum is σ = 12077184. Its totient is φ = 11933076.

The previous prime is 12005099. The next prime is 12005141. The reversal of 12005129 is 92150021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12005129 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 12005129.

It is not an unprimeable number, because it can be changed into a prime (12005629) 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, 35777 + ... + 36110.

It is an arithmetic number, because the mean of its divisors is an integer number (3019296).

Almost surely, 2^12005129 is an apocalyptic number.

It is an amenable number.

12005129 is a deficient number, since it is larger than the sum of its proper divisors (72055).

12005129 is an equidigital number, since it uses as much as digits as its factorization.

12005129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72054.

The product of its (nonzero) digits is 180, while the sum is 20.

The square root of 12005129 is about 3464.8418434324. The cubic root of 12005129 is about 228.9754618610.

The spelling of 12005129 in words is "twelve million, five thousand, one hundred twenty-nine".