18424320 has 80 divisors (see below), whose sum is σ = 58924800. Its totient is φ = 4911104.

The previous prime is 18424313. The next prime is 18424321. The reversal of 18424320 is 2342481.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (18424321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6481 + ... + 8879.

It is an arithmetic number, because the mean of its divisors is an integer number (736560).

Almost surely, 2^18424320 is an apocalyptic number.

18424320 is a gapful number since it is divisible by the number (10) 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 18424320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29462400).

18424320 is an abundant number, since it is smaller than the sum of its proper divisors (40500480).

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

18424320 is an equidigital number, since it uses as much as digits as its factorization.

18424320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2425 (or 2409 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

The square root of 18424320 is about 4292.3559964197. The cubic root of 18424320 is about 264.1174867343.

The spelling of 18424320 in words is "eighteen million, four hundred twenty-four thousand, three hundred twenty".