18717472 has 24 divisors (see below), whose sum is σ = 36976716. Its totient is φ = 9326592.

The previous prime is 18717467. The next prime is 18717473. The reversal of 18717472 is 27471781.

It can be written as a sum of positive squares in 2 ways, for example, as 18352656 + 364816 = 4284^2 + 604^2 .

It is not an unprimeable number, because it can be changed into a prime (18717473) 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 3 ways as a sum of consecutive naturals, for example, 10468 + ... + 12124.

Almost surely, 2^18717472 is an apocalyptic number.

It is an amenable number.

18717472 is a deficient number, since it is larger than the sum of its proper divisors (18259244).

18717472 is a wasteful number, since it uses less digits than its factorization.

18717472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2020 (or 2012 counting only the distinct ones).

The product of its digits is 21952, while the sum is 37.

The square root of 18717472 is about 4326.3693785899. The cubic root of 18717472 is about 265.5109260024.

The spelling of 18717472 in words is "eighteen million, seven hundred seventeen thousand, four hundred seventy-two".