12117518 has 8 divisors (see below), whose sum is σ = 20772912. Its totient is φ = 5193216.

The previous prime is 12117517. The next prime is 12117551. The reversal of 12117518 is 81571121.

12117518 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12117517) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 432755 + ... + 432782.

It is an arithmetic number, because the mean of its divisors is an integer number (2596614).

Almost surely, 2^12117518 is an apocalyptic number.

12117518 is a deficient number, since it is larger than the sum of its proper divisors (8655394).

12117518 is an equidigital number, since it uses as much as digits as its factorization.

12117518 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 865546.

The product of its digits is 560, while the sum is 26.

The square root of 12117518 is about 3481.0225509180. The cubic root of 12117518 is about 229.6877805201.

Adding to 12117518 its reverse (81571121), we get a palindrome (93688639).

The spelling of 12117518 in words is "twelve million, one hundred seventeen thousand, five hundred eighteen".