18666272 has 24 divisors (see below), whose sum is σ = 38912076. Its totient is φ = 8783872.

The previous prime is 18666253. The next prime is 18666281. The reversal of 18666272 is 27266681.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 18627856 + 38416 = 4316^2 + 196^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16613 + ... + 17700.

Almost surely, 2^18666272 is an apocalyptic number.

It is an amenable number.

18666272 is an abundant number, since it is smaller than the sum of its proper divisors (20245804).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18666272 is a wasteful number, since it uses less digits than its factorization.

18666272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34340 (or 34332 counting only the distinct ones).

The product of its digits is 48384, while the sum is 38.

The square root of 18666272 is about 4320.4481249056. The cubic root of 18666272 is about 265.2686109880.

The spelling of 18666272 in words is "eighteen million, six hundred sixty-six thousand, two hundred seventy-two".