12189505 has 16 divisors (see below), whose sum is σ = 15163344. Its totient is φ = 9400320.

The previous prime is 12189503. The next prime is 12189521. The reversal of 12189505 is 50598121.

It can be written as a sum of positive squares in 8 ways, for example, as 5574321 + 6615184 = 2361^2 + 2572^2 .

It is not a de Polignac number, because 12189505 - 2¹ = 12189503 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12189503) 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, 19579 + ... + 20191.

It is an arithmetic number, because the mean of its divisors is an integer number (947709).

Almost surely, 2^12189505 is an apocalyptic number.

It is an amenable number.

12189505 is a deficient number, since it is larger than the sum of its proper divisors (2973839).

12189505 is an equidigital number, since it uses as much as digits as its factorization.

12189505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 756.

The product of its (nonzero) digits is 3600, while the sum is 31.

The square root of 12189505 is about 3491.3471611972. The cubic root of 12189505 is about 230.1417211001.

The spelling of 12189505 in words is "twelve million, one hundred eighty-nine thousand, five hundred five".