12013209 has 12 divisors (see below), whose sum is σ = 18687396. Its totient is φ = 7392672.

The previous prime is 12013207. The next prime is 12013219. The reversal of 12013209 is 90231021.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 2576025 + 9437184 = 1605^2 + 3072^2 .

It is not a de Polignac number, because 12013209 - 2¹ = 12013207 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12013191 and 12013200.

It is not an unprimeable number, because it can be changed into a prime (12013201) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 51222 + ... + 51455.

It is an arithmetic number, because the mean of its divisors is an integer number (1557283).

Almost surely, 2^12013209 is an apocalyptic number.

It is an amenable number.

12013209 is a deficient number, since it is larger than the sum of its proper divisors (6674187).

12013209 is a wasteful number, since it uses less digits than its factorization.

12013209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102696 (or 102693 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 12013209 is about 3466.0076456927. The cubic root of 12013209 is about 229.0268206543.

The spelling of 12013209 in words is "twelve million, thirteen thousand, two hundred nine".