18218336 has 12 divisors (see below), whose sum is σ = 35867412. Its totient is φ = 9109152.

The previous prime is 18218329. The next prime is 18218357. The reversal of 18218336 is 63381281.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (32), and also a Moran number because the ratio is a prime number: 569323 = 18218336 / (1 + 8 + 2 + 1 + 8 + 3 + 3 + 6).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 284630 + ... + 284693.

It is an arithmetic number, because the mean of its divisors is an integer number (2988951).

Almost surely, 2^18218336 is an apocalyptic number.

18218336 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18218336 is a deficient number, since it is larger than the sum of its proper divisors (17649076).

18218336 is an equidigital number, since it uses as much as digits as its factorization.

18218336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 569333 (or 569325 counting only the distinct ones).

The product of its digits is 6912, while the sum is 32.

The square root of 18218336 is about 4268.2942728917. The cubic root of 18218336 is about 263.1295173780.

The spelling of 18218336 in words is "eighteen million, two hundred eighteen thousand, three hundred thirty-six".