18450197 has 4 divisors (see below), whose sum is σ = 19421280. Its totient is φ = 17479116.

The previous prime is 18450193. The next prime is 18450203. The reversal of 18450197 is 79105481.

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 18450197 - 2² = 18450193 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 (18450193) 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 3 ways as a sum of consecutive naturals, for example, 485513 + ... + 485550.

It is an arithmetic number, because the mean of its divisors is an integer number (4855320).

Almost surely, 2^18450197 is an apocalyptic number.

It is an amenable number.

18450197 is a deficient number, since it is larger than the sum of its proper divisors (971083).

18450197 is an equidigital number, since it uses as much as digits as its factorization.

18450197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 971082.

The product of its (nonzero) digits is 10080, while the sum is 35.

The square root of 18450197 is about 4295.3692507164. The cubic root of 18450197 is about 264.2410800967.

The spelling of 18450197 in words is "eighteen million, four hundred fifty thousand, one hundred ninety-seven".