18021673 has 16 divisors (see below), whose sum is σ = 19958400. Its totient is φ = 16213120.

The previous prime is 18021667. The next prime is 18021677. The reversal of 18021673 is 37612081.

It is a cyclic number.

It is not a de Polignac number, because 18021673 - 2¹⁷ = 17890601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18021677) 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 15 ways as a sum of consecutive naturals, for example, 27018 + ... + 27676.

It is an arithmetic number, because the mean of its divisors is an integer number (1247400).

Almost surely, 2^18021673 is an apocalyptic number.

It is an amenable number.

18021673 is a deficient number, since it is larger than the sum of its proper divisors (1936727).

18021673 is a wasteful number, since it uses less digits than its factorization.

18021673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 752.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 18021673 is about 4245.1941062807. The cubic root of 18021673 is about 262.1792811745.

The spelling of 18021673 in words is "eighteen million, twenty-one thousand, six hundred seventy-three".