18042816 has 56 divisors (see below), whose sum is σ = 52084224. Its totient is φ = 5466880.

The previous prime is 18042809. The next prime is 18042841. The reversal of 18042816 is 61824081.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2160 + ... + 6383.

Almost surely, 2^18042816 is an apocalyptic number.

18042816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18042816 is an abundant number, since it is smaller than the sum of its proper divisors (34041408).

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

18042816 is a wasteful number, since it uses less digits than its factorization.

18042816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8569 (or 8559 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 30.

The square root of 18042816 is about 4247.6836040364. The cubic root of 18042816 is about 262.2817705526.

Adding to 18042816 its reverse (61824081), we get a palindrome (79866897).

The spelling of 18042816 in words is "eighteen million, forty-two thousand, eight hundred sixteen".