18331230 has 64 divisors (see below), whose sum is σ = 47443968. Its totient is φ = 4519680.

The previous prime is 18331217. The next prime is 18331231. The reversal of 18331230 is 3213381.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 18331197 and 18331206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18331231) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20962 + ... + 21818.

It is an arithmetic number, because the mean of its divisors is an integer number (741312).

Almost surely, 2^18331230 is an apocalyptic number.

18331230 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 18331230, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23721984).

18331230 is an abundant number, since it is smaller than the sum of its proper divisors (29112738).

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

18331230 is a wasteful number, since it uses less digits than its factorization.

18331230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 921.

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 18331230 is about 4281.4985694264. The cubic root of 18331230 is about 263.6719122244.

It can be divided in two parts, 183 and 31230, that added together give a palindrome (31413).

The spelling of 18331230 in words is "eighteen million, three hundred thirty-one thousand, two hundred thirty".