18427117 has 4 divisors (see below), whose sum is σ = 19228320. Its totient is φ = 17625916.

The previous prime is 18427103. The next prime is 18427141. The reversal of 18427117 is 71172481.

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, and also an emirpimes, since its reverse is a distinct semiprime: 71172481 = 53 ⋅1342877.

It is a cyclic number.

It is not a de Polignac number, because 18427117 - 2¹⁵ = 18394349 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18427417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 400567 + ... + 400612.

It is an arithmetic number, because the mean of its divisors is an integer number (4807080).

Almost surely, 2^18427117 is an apocalyptic number.

It is an amenable number.

18427117 is a deficient number, since it is larger than the sum of its proper divisors (801203).

18427117 is an equidigital number, since it uses as much as digits as its factorization.

18427117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 801202.

The product of its digits is 3136, while the sum is 31.

The square root of 18427117 is about 4292.6817958008. The cubic root of 18427117 is about 264.1308513023.

Adding to 18427117 its reverse (71172481), we get a palindrome (89599598).

The spelling of 18427117 in words is "eighteen million, four hundred twenty-seven thousand, one hundred seventeen".