18864197 has 8 divisors (see below), whose sum is σ = 20648640. Its totient is φ = 17091360.

The previous prime is 18864187. The next prime is 18864211. The reversal of 18864197 is 79146881.

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

It is not a de Polignac number, because 18864197 - 2²⁰ = 17815621 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 (18864137) 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 7 ways as a sum of consecutive naturals, for example, 704 + ... + 6182.

It is an arithmetic number, because the mean of its divisors is an integer number (2581080).

Almost surely, 2^18864197 is an apocalyptic number.

It is an amenable number.

18864197 is a deficient number, since it is larger than the sum of its proper divisors (1784443).

18864197 is a wasteful number, since it uses less digits than its factorization.

18864197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5803.

The product of its digits is 96768, while the sum is 44.

The square root of 18864197 is about 4343.2933357074. The cubic root of 18864197 is about 266.2028951177.

The spelling of 18864197 in words is "eighteen million, eight hundred sixty-four thousand, one hundred ninety-seven".