18006318 has 48 divisors (see below), whose sum is σ = 42861312. Its totient is φ = 5418000.

The previous prime is 18006299. The next prime is 18006323. The reversal of 18006318 is 81360081.

18006318 is a modest number, since divided by 6318 gives 18 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 18006291 and 18006300.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 41563 + ... + 41993.

It is an arithmetic number, because the mean of its divisors is an integer number (892944).

Almost surely, 2^18006318 is an apocalyptic number.

18006318 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18006318, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21430656).

18006318 is an abundant number, since it is smaller than the sum of its proper divisors (24854994).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18006318 is a wasteful number, since it uses less digits than its factorization.

18006318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 661 (or 658 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 18006318 is about 4243.3852052341. The cubic root of 18006318 is about 262.1047985084.

Adding to 18006318 its reverse (81360081), we get a palindrome (99366399).

It can be divided in two parts, 180063 and 18, that added together give a palindrome (180081).

The spelling of 18006318 in words is "eighteen million, six thousand, three hundred eighteen".