18324432 has 150 divisors (see below), whose sum is σ = 60955362. Its totient is φ = 5136768.

The previous prime is 18324403. The next prime is 18324443. The reversal of 18324432 is 23442381.

It can be written as a sum of positive squares in only one way, i.e., 16941456 + 1382976 = 4116^2 + 1176^2 .

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 18324396 and 18324405.

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 in 29 ways as a sum of consecutive naturals, for example, 345718 + ... + 345770.

Almost surely, 2^18324432 is an apocalyptic number.

18324432 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18324432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30477681).

18324432 is an abundant number, since it is smaller than the sum of its proper divisors (42630930).

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

18324432 is an equidigital number, since it uses as much as digits as its factorization.

18324432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95 (or 65 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

The square root of 18324432 is about 4280.7046148969. The cubic root of 18324432 is about 263.6393146068.

The spelling of 18324432 in words is "eighteen million, three hundred twenty-four thousand, four hundred thirty-two".