18716197 has 4 divisors (see below), whose sum is σ = 19701280. Its totient is φ = 17731116.

The previous prime is 18716189. The next prime is 18716221. The reversal of 18716197 is 79161781.

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.

It is a cyclic number.

It is not a de Polignac number, because 18716197 - 2³ = 18716189 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 (18716177) 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, 492513 + ... + 492550.

It is an arithmetic number, because the mean of its divisors is an integer number (4925320).

Almost surely, 2^18716197 is an apocalyptic number.

It is an amenable number.

18716197 is a deficient number, since it is larger than the sum of its proper divisors (985083).

18716197 is an equidigital number, since it uses as much as digits as its factorization.

18716197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 985082.

The product of its digits is 21168, while the sum is 40.

The square root of 18716197 is about 4326.2220238911. Note that the first 3 decimals coincide. The cubic root of 18716197 is about 265.5048971591.

It can be divided in two parts, 187 and 16197, that added together give a 14-th power (16384 = 2¹⁴).

The spelling of 18716197 in words is "eighteen million, seven hundred sixteen thousand, one hundred ninety-seven".