18808217 has 8 divisors (see below), whose sum is σ = 19324032. Its totient is φ = 18295200.

The previous prime is 18808199. The next prime is 18808259. The reversal of 18808217 is 71280881.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18808217 - 2¹⁰ = 18807193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18808267) 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, 25508 + ... + 26234.

It is an arithmetic number, because the mean of its divisors is an integer number (2415504).

Almost surely, 2^18808217 is an apocalyptic number.

It is an amenable number.

18808217 is a deficient number, since it is larger than the sum of its proper divisors (515815).

18808217 is an equidigital number, since it uses as much as digits as its factorization.

18808217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1399.

The product of its (nonzero) digits is 7168, while the sum is 35.

The square root of 18808217 is about 4336.8441290874. The cubic root of 18808217 is about 265.9393128557.

The spelling of 18808217 in words is "eighteen million, eight hundred eight thousand, two hundred seventeen".