18518272 has 18 divisors (see below), whose sum is σ = 36964718. Its totient is φ = 9259008.

The previous prime is 18518261. The next prime is 18518299. The reversal of 18518272 is 27281581.

It can be written as a sum of positive squares in only one way, i.e., 14258176 + 4260096 = 3776^2 + 2064^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35913 + ... + 36424.

Almost surely, 2^18518272 is an apocalyptic number.

It is an amenable number.

18518272 is a deficient number, since it is larger than the sum of its proper divisors (18446446).

18518272 is an frugal number, since it uses more digits than its factorization.

18518272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72353 (or 72339 counting only the distinct ones).

The product of its digits is 8960, while the sum is 34.

The square root of 18518272 is about 4303.2861861605. The cubic root of 18518272 is about 264.5656680182.

The spelling of 18518272 in words is "eighteen million, five hundred eighteen thousand, two hundred seventy-two".