18243330 has 64 divisors (see below), whose sum is σ = 50561280. Its totient is φ = 4126464.

The previous prime is 18243293. The next prime is 18243343. The reversal of 18243330 is 3334281.

It is a self number, because there is not a number n which added to its sum of digits gives 18243330.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 22492 + ... + 23288.

It is an arithmetic number, because the mean of its divisors is an integer number (790020).

Almost surely, 2^18243330 is an apocalyptic number.

18243330 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18243330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25280640).

18243330 is an abundant number, since it is smaller than the sum of its proper divisors (32317950).

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

18243330 is a wasteful number, since it uses less digits than its factorization.

18243330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 923.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 18243330 is about 4271.2211368647. The cubic root of 18243330 is about 263.2497927955.

The spelling of 18243330 in words is "eighteen million, two hundred forty-three thousand, three hundred thirty".