12020209 has 2 divisors, whose sum is σ = 12020210. Its totient is φ = 12020208.

The previous prime is 12020161. The next prime is 12020221. The reversal of 12020209 is 90202021.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10419984 + 1600225 = 3228^2 + 1265^2 .

It is a cyclic number.

It is not a de Polignac number, because 12020209 - 2¹³ = 12012017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12020192 and 12020201.

It is not a weakly prime, because it can be changed into another prime (12020249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6010104 + 6010105.

It is an arithmetic number, because the mean of its divisors is an integer number (6010105).

Almost surely, 2^12020209 is an apocalyptic number.

It is an amenable number.

12020209 is a deficient number, since it is larger than the sum of its proper divisors (1).

12020209 is an equidigital number, since it uses as much as digits as its factorization.

12020209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 12020209 is about 3467.0173059851. The cubic root of 12020209 is about 229.0712960440.

The spelling of 12020209 in words is "twelve million, twenty thousand, two hundred nine".