18168197 has 8 divisors (see below), whose sum is σ = 18487896. Its totient is φ = 17851392.

The previous prime is 18168187. The next prime is 18168203. The reversal of 18168197 is 79186181.

It can be written as a sum of positive squares in 4 ways, for example, as 1267876 + 16900321 = 1126^2 + 4111^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18168197 - 2¹² = 18164101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18168187) 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 7 ways as a sum of consecutive naturals, for example, 14633 + ... + 15825.

It is an arithmetic number, because the mean of its divisors is an integer number (2310987).

Almost surely, 2^18168197 is an apocalyptic number.

It is an amenable number.

18168197 is a deficient number, since it is larger than the sum of its proper divisors (319699).

18168197 is a wasteful number, since it uses less digits than its factorization.

18168197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1447.

The product of its digits is 24192, while the sum is 41.

The square root of 18168197 is about 4262.4168027071. The cubic root of 18168197 is about 262.8879078195.

The spelling of 18168197 in words is "eighteen million, one hundred sixty-eight thousand, one hundred ninety-seven".