12001209 has 16 divisors (see below), whose sum is σ = 17929920. Its totient is φ = 7076160.

The previous prime is 12001207. The next prime is 12001211. The reversal of 12001209 is 90210021.

It is a happy number.

12001209 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (12001207) and next prime (12001211).

It is not a de Polignac number, because 12001209 - 2¹ = 12001207 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12001207) 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, 3694 + ... + 6135.

It is an arithmetic number, because the mean of its divisors is an integer number (1120620).

Almost surely, 2^12001209 is an apocalyptic number.

It is an amenable number.

12001209 is a deficient number, since it is larger than the sum of its proper divisors (5928711).

12001209 is a wasteful number, since it uses less digits than its factorization.

12001209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9880.

The product of its (nonzero) digits is 36, while the sum is 15.

The square root of 12001209 is about 3464.2761148615. The cubic root of 12001209 is about 228.9505369165.

The spelling of 12001209 in words is "twelve million, one thousand, two hundred nine".