12418209 has 6 divisors (see below), whose sum is σ = 17937426. Its totient is φ = 8278800.

The previous prime is 12418193. The next prime is 12418213. The reversal of 12418209 is 90281421.

It can be written as a sum of positive squares in only one way, i.e., 7700625 + 4717584 = 2775^2 + 2172^2 .

It is not a de Polignac number, because 12418209 - 2⁴ = 12418193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12418309) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 689892 + ... + 689909.

It is an arithmetic number, because the mean of its divisors is an integer number (2989571).

Almost surely, 2^12418209 is an apocalyptic number.

It is an amenable number.

12418209 is a deficient number, since it is larger than the sum of its proper divisors (5519217).

12418209 is a wasteful number, since it uses less digits than its factorization.

12418209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1379807 (or 1379804 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 12418209 is about 3523.9479281056. The cubic root of 12418209 is about 231.5721466857.

The spelling of 12418209 in words is "twelve million, four hundred eighteen thousand, two hundred nine".