18808216 has 32 divisors (see below), whose sum is σ = 41070240. Its totient is φ = 7907328.

The previous prime is 18808199. The next prime is 18808259. The reversal of 18808216 is 61280881.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 201 + ... + 6136.

It is an arithmetic number, because the mean of its divisors is an integer number (1283445).

Almost surely, 2^18808216 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18808216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20535120).

18808216 is an abundant number, since it is smaller than the sum of its proper divisors (22262024).

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

18808216 is a wasteful number, since it uses less digits than its factorization.

18808216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6403 (or 6399 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 34.

The square root of 18808216 is about 4336.8440137962. The cubic root of 18808216 is about 265.9393081425.

The spelling of 18808216 in words is "eighteen million, eight hundred eight thousand, two hundred sixteen".