18522973 has 8 divisors (see below), whose sum is σ = 21264192. Its totient is φ = 15805536.

The previous prime is 18522961. The next prime is 18523003. The reversal of 18522973 is 37922581.

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

It is a cyclic number.

It is not a de Polignac number, because 18522973 - 2⁵ = 18522941 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 (18522913) 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, 4240 + ... + 7417.

It is an arithmetic number, because the mean of its divisors is an integer number (2658024).

Almost surely, 2^18522973 is an apocalyptic number.

It is an amenable number.

18522973 is a deficient number, since it is larger than the sum of its proper divisors (2741219).

18522973 is a wasteful number, since it uses less digits than its factorization.

18522973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11891.

The product of its digits is 30240, while the sum is 37.

The square root of 18522973 is about 4303.8323619769. The cubic root of 18522973 is about 264.5880534398.

The spelling of 18522973 in words is "eighteen million, five hundred twenty-two thousand, nine hundred seventy-three".