18023818 has 8 divisors (see below), whose sum is σ = 28458720. Its totient is φ = 8537580.

The previous prime is 18023801. The next prime is 18023821. The reversal of 18023818 is 81832081.

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 18023818.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 237118 + ... + 237193.

It is an arithmetic number, because the mean of its divisors is an integer number (3557340).

Almost surely, 2^18023818 is an apocalyptic number.

18023818 is a deficient number, since it is larger than the sum of its proper divisors (10434902).

18023818 is a wasteful number, since it uses less digits than its factorization.

18023818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 474332.

The product of its (nonzero) digits is 3072, while the sum is 31.

The square root of 18023818 is about 4245.4467373882. The cubic root of 18023818 is about 262.1896825812.

Adding to 18023818 its reverse (81832081), we get a palindrome (99855899).

The spelling of 18023818 in words is "eighteen million, twenty-three thousand, eight hundred eighteen".