18088217 has 4 divisors (see below), whose sum is σ = 20672256. Its totient is φ = 15504180.

The previous prime is 18088207. The next prime is 18088219. The reversal of 18088217 is 71288081.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18088217 - 2¹⁶ = 18022681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18088219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1292009 + ... + 1292022.

It is an arithmetic number, because the mean of its divisors is an integer number (5168064).

Almost surely, 2^18088217 is an apocalyptic number.

It is an amenable number.

18088217 is a deficient number, since it is larger than the sum of its proper divisors (2584039).

18088217 is an equidigital number, since it uses as much as digits as its factorization.

18088217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2584038.

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

The square root of 18088217 is about 4253.0244532568. The cubic root of 18088217 is about 262.5015788265.

The spelling of 18088217 in words is "eighteen million, eighty-eight thousand, two hundred seventeen".