18873217 has 12 divisors (see below), whose sum is σ = 21093268. Its totient is φ = 16869600.

The previous prime is 18873199. The next prime is 18873227. The reversal of 18873217 is 71237881.

It can be written as a sum of positive squares in 2 ways, for example, as 3538161 + 15335056 = 1881^2 + 3916^2 .

It is not a de Polignac number, because 18873217 - 2¹⁵ = 18840449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18873227) 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, 6103 + ... + 8659.

Almost surely, 2^18873217 is an apocalyptic number.

It is an amenable number.

18873217 is a deficient number, since it is larger than the sum of its proper divisors (2220051).

18873217 is a wasteful number, since it uses less digits than its factorization.

18873217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2640 (or 2629 counting only the distinct ones).

The product of its digits is 18816, while the sum is 37.

The square root of 18873217 is about 4344.3315941581. The cubic root of 18873217 is about 266.2453170578.

The spelling of 18873217 in words is "eighteen million, eight hundred seventy-three thousand, two hundred seventeen".