18047232 has 144 divisors (see below), whose sum is σ = 61156480. Its totient is φ = 5142528.

The previous prime is 18047209. The next prime is 18047233. The reversal of 18047232 is 23274081.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 18047196 and 18047205.

It is not an unprimeable number, because it can be changed into a prime (18047233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48198 + ... + 48570.

Almost surely, 2^18047232 is an apocalyptic number.

18047232 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 18047232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30578240).

18047232 is an abundant number, since it is smaller than the sum of its proper divisors (43109248).

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

18047232 is an equidigital number, since it uses as much as digits as its factorization.

18047232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405 (or 385 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 18047232 is about 4248.2033849617. The cubic root of 18047232 is about 262.3031667289.

The spelling of 18047232 in words is "eighteen million, forty-seven thousand, two hundred thirty-two".