12006209 has 4 divisors (see below), whose sum is σ = 12013140. Its totient is φ = 11999280.

The previous prime is 12006193. The next prime is 12006217. The reversal of 12006209 is 90260021.

12006209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 90260021 = 17 ⋅5309413.

It can be written as a sum of positive squares in 2 ways, for example, as 1149184 + 10857025 = 1072^2 + 3295^2 .

It is a cyclic number.

It is not a de Polignac number, because 12006209 - 2⁴ = 12006193 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12006229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1727 + ... + 5195.

It is an arithmetic number, because the mean of its divisors is an integer number (3003285).

Almost surely, 2^12006209 is an apocalyptic number.

It is an amenable number.

12006209 is a deficient number, since it is larger than the sum of its proper divisors (6931).

12006209 is an equidigital number, since it uses as much as digits as its factorization.

12006209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6930.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 12006209 is about 3464.9976911969. The cubic root of 12006209 is about 228.9823279842.

The spelling of 12006209 in words is "twelve million, six thousand, two hundred nine".