18918818 has 8 divisors (see below), whose sum is σ = 28410048. Its totient is φ = 9448804.

The previous prime is 18918797. The next prime is 18918829. The reversal of 18918818 is 81881981.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

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, 2846 + ... + 6777.

It is an arithmetic number, because the mean of its divisors is an integer number (3551256).

Almost surely, 2^18918818 is an apocalyptic number.

18918818 is a deficient number, since it is larger than the sum of its proper divisors (9491230).

18918818 is an equidigital number, since it uses as much as digits as its factorization.

18918818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10608.

The product of its digits is 36864, while the sum is 44.

The square root of 18918818 is about 4349.5767610194. The cubic root of 18918818 is about 266.4595763704.

The spelling of 18918818 in words is "eighteen million, nine hundred eighteen thousand, eight hundred eighteen".