18918873 has 24 divisors (see below), whose sum is σ = 28632800. Its totient is φ = 12345480.

The previous prime is 18918871. The next prime is 18918883. The reversal of 18918873 is 37881981.

It is not a de Polignac number, because 18918873 - 2¹ = 18918871 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18918871) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 136038 + ... + 136176.

Almost surely, 2^18918873 is an apocalyptic number.

It is an amenable number.

18918873 is a deficient number, since it is larger than the sum of its proper divisors (9713927).

18918873 is an equidigital number, since it uses as much as digits as its factorization.

18918873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290 (or 213 counting only the distinct ones).

The product of its digits is 96768, while the sum is 45.

The square root of 18918873 is about 4349.5830834690. The cubic root of 18918873 is about 266.4598345836.

It can be divided in two parts, 18918 and 873, that added together give a palindrome (19791).

The spelling of 18918873 in words is "eighteen million, nine hundred eighteen thousand, eight hundred seventy-three".