18240208 has 20 divisors (see below), whose sum is σ = 40389280. Its totient is φ = 7817184.

The previous prime is 18240191. The next prime is 18240221. The reversal of 18240208 is 80204281.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81318 + ... + 81541.

It is an arithmetic number, because the mean of its divisors is an integer number (2019464).

Almost surely, 2^18240208 is an apocalyptic number.

It is an amenable number.

18240208 is an abundant number, since it is smaller than the sum of its proper divisors (22149072).

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

18240208 is a wasteful number, since it uses less digits than its factorization.

18240208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162874 (or 162868 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 25.

The square root of 18240208 is about 4270.8556519742. The cubic root of 18240208 is about 263.2347752021.

Adding to 18240208 its reverse (80204281), we get a palindrome (98444489).

The spelling of 18240208 in words is "eighteen million, two hundred forty thousand, two hundred eight".