18618272 has 12 divisors (see below), whose sum is σ = 36654786. Its totient is φ = 9309120.

The previous prime is 18618253. The next prime is 18618283. The reversal of 18618272 is 27281681.

It can be written as a sum of positive squares in only one way, i.e., 12645136 + 5973136 = 3556^2 + 2444^2 .

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 290879 + ... + 290942.

Almost surely, 2^18618272 is an apocalyptic number.

It is an amenable number.

18618272 is a deficient number, since it is larger than the sum of its proper divisors (18036514).

18618272 is an equidigital number, since it uses as much as digits as its factorization.

18618272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 581831 (or 581823 counting only the distinct ones).

The product of its digits is 10752, while the sum is 35.

The square root of 18618272 is about 4314.8895698500. The cubic root of 18618272 is about 265.0410379070.

It can be divided in two parts, 18 and 618272, that multiplied together give a square (11128896 = 3336²).

The spelling of 18618272 in words is "eighteen million, six hundred eighteen thousand, two hundred seventy-two".