18450117 has 72 divisors (see below), whose sum is σ = 34572096. Its totient is φ = 9402624.

The previous prime is 18450109. The next prime is 18450127. The reversal of 18450117 is 71105481.

It is not a de Polignac number, because 18450117 - 2³ = 18450109 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18450127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 172378 + ... + 172484.

It is an arithmetic number, because the mean of its divisors is an integer number (480168).

Almost surely, 2^18450117 is an apocalyptic number.

18450117 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

18450117 is a deficient number, since it is larger than the sum of its proper divisors (16121979).

18450117 is a wasteful number, since it uses less digits than its factorization.

18450117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167 (or 157 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 27.

The square root of 18450117 is about 4295.3599383521. The cubic root of 18450117 is about 264.2406981799.

Adding to 18450117 its reverse (71105481), we get a palindrome (89555598).

The spelling of 18450117 in words is "eighteen million, four hundred fifty thousand, one hundred seventeen".