18000117 has 8 divisors (see below), whose sum is σ = 26666880. Its totient is φ = 12000060.

The previous prime is 18000089. The next prime is 18000137. The reversal of 18000117 is 71100081.

It is not a de Polignac number, because 18000117 - 2¹¹ = 17998069 is a prime.

18000117 is a modest number, since divided by 117 gives 18 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 18000117.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18000137) 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, 333309 + ... + 333362.

It is an arithmetic number, because the mean of its divisors is an integer number (3333360).

Almost surely, 2^18000117 is an apocalyptic number.

It is an amenable number.

18000117 is a deficient number, since it is larger than the sum of its proper divisors (8666763).

18000117 is an equidigital number, since it uses as much as digits as its factorization.

18000117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666680 (or 666674 counting only the distinct ones).

The product of its (nonzero) digits is 56, while the sum is 18.

The square root of 18000117 is about 4242.6544756791. The cubic root of 18000117 is about 262.0747072470.

Adding to 18000117 its reverse (71100081), we get a palindrome (89100198).

The spelling of 18000117 in words is "eighteen million, one hundred seventeen", and thus it is an aban number.