18549872 has 20 divisors (see below), whose sum is σ = 39208056. Its totient is φ = 8431680.

The previous prime is 18549863. The next prime is 18549877. The reversal of 18549872 is 27894581.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18549877) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52523 + ... + 52874.

Almost surely, 2^18549872 is an apocalyptic number.

It is an amenable number.

18549872 is an abundant number, since it is smaller than the sum of its proper divisors (20658184).

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

18549872 is a wasteful number, since it uses less digits than its factorization.

18549872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105416 (or 105410 counting only the distinct ones).

The product of its digits is 161280, while the sum is 44.

The square root of 18549872 is about 4306.9562338152. The cubic root of 18549872 is about 264.7160694564.

The spelling of 18549872 in words is "eighteen million, five hundred forty-nine thousand, eight hundred seventy-two".