18668673 has 12 divisors (see below), whose sum is σ = 27161680. Its totient is φ = 12355416.

The previous prime is 18668641. The next prime is 18668687. The reversal of 18668673 is 37686681.

It is not a de Polignac number, because 18668673 - 2⁵ = 18668641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18668693) 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, 6211 + ... + 8712.

Almost surely, 2^18668673 is an apocalyptic number.

It is an amenable number.

18668673 is a deficient number, since it is larger than the sum of its proper divisors (8493007).

18668673 is a wasteful number, since it uses less digits than its factorization.

18668673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15068 (or 15065 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 18668673 is about 4320.7259806657. The cubic root of 18668673 is about 265.2799841325.

Subtracting from 18668673 its product of digits (290304), we obtain a square (18378369 = 4287²).

The spelling of 18668673 in words is "eighteen million, six hundred sixty-eight thousand, six hundred seventy-three".