18973163 has 12 divisors (see below), whose sum is σ = 21577920. Its totient is φ = 16650480.

The previous prime is 18973159. The next prime is 18973181. The reversal of 18973163 is 36137981.

It is not a de Polignac number, because 18973163 - 2² = 18973159 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18973763) 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 11 ways as a sum of consecutive naturals, for example, 806 + ... + 6212.

It is an arithmetic number, because the mean of its divisors is an integer number (1798160).

Almost surely, 2^18973163 is an apocalyptic number.

18973163 is a deficient number, since it is larger than the sum of its proper divisors (2604757).

18973163 is a wasteful number, since it uses less digits than its factorization.

18973163 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5458 (or 5447 counting only the distinct ones).

The product of its digits is 27216, while the sum is 38.

The square root of 18973163 is about 4355.8194407023. The cubic root of 18973163 is about 266.7144707701.

The spelling of 18973163 in words is "eighteen million, nine hundred seventy-three thousand, one hundred sixty-three".