18217105 has 16 divisors (see below), whose sum is σ = 23137920. Its totient is φ = 13730688.

The previous prime is 18217103. The next prime is 18217117. The reversal of 18217105 is 50171281.

It is a cyclic number.

It is not a de Polignac number, because 18217105 - 2¹ = 18217103 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18217105.

It is not an unprimeable number, because it can be changed into a prime (18217103) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21724 + ... + 22546.

It is an arithmetic number, because the mean of its divisors is an integer number (1446120).

Almost surely, 2^18217105 is an apocalyptic number.

It is an amenable number.

18217105 is a deficient number, since it is larger than the sum of its proper divisors (4920815).

18217105 is a wasteful number, since it uses less digits than its factorization.

18217105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1080.

The product of its (nonzero) digits is 560, while the sum is 25.

The square root of 18217105 is about 4268.1500676523. The cubic root of 18217105 is about 263.1235907531.

Adding to 18217105 its reverse (50171281), we get a palindrome (68388386).

The spelling of 18217105 in words is "eighteen million, two hundred seventeen thousand, one hundred five".