12117309 has 8 divisors (see below), whose sum is σ = 16238400. Its totient is φ = 8037216.

The previous prime is 12117289. The next prime is 12117317. The reversal of 12117309 is 90371121.

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

It is not a de Polignac number, because 12117309 - 2¹⁷ = 11986237 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12117319) 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, 9552 + ... + 10745.

It is an arithmetic number, because the mean of its divisors is an integer number (2029800).

Almost surely, 2^12117309 is an apocalyptic number.

It is an amenable number.

12117309 is a deficient number, since it is larger than the sum of its proper divisors (4121091).

12117309 is a wasteful number, since it uses less digits than its factorization.

12117309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20499.

The product of its (nonzero) digits is 378, while the sum is 24.

The square root of 12117309 is about 3480.9925308739. The cubic root of 12117309 is about 229.6864599796.

The spelling of 12117309 in words is "twelve million, one hundred seventeen thousand, three hundred nine".