12120009 has 8 divisors (see below), whose sum is σ = 17629152. Its totient is φ = 7345440.

The previous prime is 12120001. The next prime is 12120019. The reversal of 12120009 is 90002121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12120009 - 2³ = 12120001 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 12120009.

It is not an unprimeable number, because it can be changed into a prime (12120001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 183604 + ... + 183669.

It is an arithmetic number, because the mean of its divisors is an integer number (2203644).

Almost surely, 2^12120009 is an apocalyptic number.

It is an amenable number.

12120009 is a deficient number, since it is larger than the sum of its proper divisors (5509143).

12120009 is a wasteful number, since it uses less digits than its factorization.

12120009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 367287.

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

The square root of 12120009 is about 3481.3803296968. The cubic root of 12120009 is about 229.7035184256.

It can be divided in two parts, 12 and 120009, that added together give a palindrome (120021).

The spelling of 12120009 in words is "twelve million, one hundred twenty thousand, nine".