18945872 has 20 divisors (see below), whose sum is σ = 40045056. Its totient is φ = 8611680.

The previous prime is 18945821. The next prime is 18945877. The reversal of 18945872 is 27854981.

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 (18945877) 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, 53648 + ... + 53999.

Almost surely, 2^18945872 is an apocalyptic number.

It is an amenable number.

18945872 is an abundant number, since it is smaller than the sum of its proper divisors (21099184).

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

18945872 is a wasteful number, since it uses less digits than its factorization.

18945872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107666 (or 107660 counting only the distinct ones).

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

The square root of 18945872 is about 4352.6856077599. The cubic root of 18945872 is about 266.5865286973.

The spelling of 18945872 in words is "eighteen million, nine hundred forty-five thousand, eight hundred seventy-two".