18564973 has 12 divisors (see below), whose sum is σ = 21705600. Its totient is φ = 15832152.

The previous prime is 18564971. The next prime is 18564983. The reversal of 18564973 is 37946581.

It is not a de Polignac number, because 18564973 - 2¹ = 18564971 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18564971) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10078 + ... + 11776.

It is an arithmetic number, because the mean of its divisors is an integer number (1808800).

Almost surely, 2^18564973 is an apocalyptic number.

It is an amenable number.

18564973 is a deficient number, since it is larger than the sum of its proper divisors (3140627).

18564973 is a wasteful number, since it uses less digits than its factorization.

18564973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1936 (or 1929 counting only the distinct ones).

The product of its digits is 181440, while the sum is 43.

The square root of 18564973 is about 4308.7089713741. The cubic root of 18564973 is about 264.7878829458.

The spelling of 18564973 in words is "eighteen million, five hundred sixty-four thousand, nine hundred seventy-three".