18117418 has 8 divisors (see below), whose sum is σ = 29646720. Its totient is φ = 8235180.

The previous prime is 18117413. The next prime is 18117443. The reversal of 18117418 is 81471181.

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

It is a self number, because there is not a number n which added to its sum of digits gives 18117418.

It is not an unprimeable number, because it can be changed into a prime (18117413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 411738 + ... + 411781.

It is an arithmetic number, because the mean of its divisors is an integer number (3705840).

Almost surely, 2^18117418 is an apocalyptic number.

18117418 is a deficient number, since it is larger than the sum of its proper divisors (11529302).

18117418 is a wasteful number, since it uses less digits than its factorization.

18117418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 823532.

The product of its digits is 1792, while the sum is 31.

The square root of 18117418 is about 4256.4560375975. The cubic root of 18117418 is about 262.6427607430.

Adding to 18117418 its reverse (81471181), we get a palindrome (99588599).

It can be divided in two parts, 1811 and 7418, that added together give a palindrome (9229).

The spelling of 18117418 in words is "eighteen million, one hundred seventeen thousand, four hundred eighteen".