18383218 has 8 divisors (see below), whose sum is σ = 31514112. Its totient is φ = 7878516.

The previous prime is 18383213. The next prime is 18383227. The reversal of 18383218 is 81238381.

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

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (18383213) 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, 656530 + ... + 656557.

It is an arithmetic number, because the mean of its divisors is an integer number (3939264).

Almost surely, 2^18383218 is an apocalyptic number.

18383218 is a deficient number, since it is larger than the sum of its proper divisors (13130894).

18383218 is a wasteful number, since it uses less digits than its factorization.

18383218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1313096.

The product of its digits is 9216, while the sum is 34.

The square root of 18383218 is about 4287.5655097036. The cubic root of 18383218 is about 263.9209378340.

The spelling of 18383218 in words is "eighteen million, three hundred eighty-three thousand, two hundred eighteen".