18042304 has 112 divisors (see below), whose sum is σ = 45646848. Its totient is φ = 6893568.

The previous prime is 18042293. The next prime is 18042319. The reversal of 18042304 is 40324081.

It is a tau number, because it is divible by the number of its divisors (112).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 175117 + ... + 175219.

Almost surely, 2^18042304 is an apocalyptic number.

18042304 is a gapful number since it is divisible by the number (14) 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 18042304, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22823424).

18042304 is an abundant number, since it is smaller than the sum of its proper divisors (27604544).

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

18042304 is a wasteful number, since it uses less digits than its factorization.

18042304 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162 (or 152 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 18042304 is about 4247.6233354666. The cubic root of 18042304 is about 262.2792896107.

Adding to 18042304 its reverse (40324081), we get a palindrome (58366385).

The spelling of 18042304 in words is "eighteen million, forty-two thousand, three hundred four".