12045209 has 16 divisors (see below), whose sum is σ = 13547520. Its totient is φ = 10617360.

The previous prime is 12045181. The next prime is 12045217. The reversal of 12045209 is 90254021.

It is not a de Polignac number, because 12045209 - 2⁸ = 12044953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12045269) 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, 72044 + ... + 72210.

It is an arithmetic number, because the mean of its divisors is an integer number (846720).

Almost surely, 2^12045209 is an apocalyptic number.

It is an amenable number.

12045209 is a deficient number, since it is larger than the sum of its proper divisors (1502311).

12045209 is a wasteful number, since it uses less digits than its factorization.

12045209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 12045209 is about 3470.6208378329. The cubic root of 12045209 is about 229.2299959118.

The spelling of 12045209 in words is "twelve million, forty-five thousand, two hundred nine".