12000009 has 16 divisors (see below), whose sum is σ = 18421760. Its totient is φ = 6806160.

The previous prime is 11999989. The next prime is 12000017. The reversal of 12000009 is 90000021.

It is a happy number.

12000009 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12000009 - 2¹⁷ = 11868937 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 11999958 and 12000003.

It is not an unprimeable number, because it can be changed into a prime (12000029) 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, 864 + ... + 4974.

It is an arithmetic number, because the mean of its divisors is an integer number (1151360).

Almost surely, 2^12000009 is an apocalyptic number.

It is an amenable number.

12000009 is a deficient number, since it is larger than the sum of its proper divisors (6421751).

12000009 is a wasteful number, since it uses less digits than its factorization.

12000009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4260.

The product of its (nonzero) digits is 18, while the sum is 12.

The square root of 12000009 is about 3464.1029141756. The cubic root of 12000009 is about 228.9429057464.

Adding to 12000009 its sum of digits (12), we get a palindrome (12000021).

The spelling of 12000009 in words is "twelve million, nine", and thus it is an aban number and an uban number.