18443232 has 72 divisors (see below), whose sum is σ = 55547856. Its totient is φ = 5784576.

The previous prime is 18443213. The next prime is 18443237. The reversal of 18443232 is 23234481.

It is a tau number, because it is divible by the number of its divisors (72).

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 = 18443196 and 18443205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18443237) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3013 + ... + 6779.

It is an arithmetic number, because the mean of its divisors is an integer number (771498).

Almost surely, 2^18443232 is an apocalyptic number.

18443232 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 18443232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27773928).

18443232 is an abundant number, since it is smaller than the sum of its proper divisors (37104624).

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

18443232 is a wasteful number, since it uses less digits than its factorization.

18443232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3800 (or 3789 counting only the distinct ones).

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

The square root of 18443232 is about 4294.5584173463. The cubic root of 18443232 is about 264.2078253341.

The spelling of 18443232 in words is "eighteen million, four hundred forty-three thousand, two hundred thirty-two".