18122017 has 4 divisors (see below), whose sum is σ = 19188036. Its totient is φ = 17056000.

The previous prime is 18121997. The next prime is 18122021. The reversal of 18122017 is 71022181.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15808576 + 2313441 = 3976^2 + 1521^2 .

It is a cyclic number.

It is not a de Polignac number, because 18122017 - 2¹⁹ = 17597729 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (18122057) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 532984 + ... + 533017.

It is an arithmetic number, because the mean of its divisors is an integer number (4797009).

Almost surely, 2^18122017 is an apocalyptic number.

18122017 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

18122017 is a deficient number, since it is larger than the sum of its proper divisors (1066019).

18122017 is a wasteful number, since it uses less digits than its factorization.

18122017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1066018.

The product of its (nonzero) digits is 224, while the sum is 22.

The square root of 18122017 is about 4256.9962414830. The cubic root of 18122017 is about 262.6649823029.

Adding to 18122017 its reverse (71022181), we get a palindrome (89144198).

The spelling of 18122017 in words is "eighteen million, one hundred twenty-two thousand, seventeen".