18718118 has 4 divisors (see below), whose sum is σ = 28077180. Its totient is φ = 9359058.

The previous prime is 18718103. The next prime is 18718121. The reversal of 18718118 is 81181781.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4679528 + ... + 4679531.

It is an arithmetic number, because the mean of its divisors is an integer number (7019295).

Almost surely, 2^18718118 is an apocalyptic number.

18718118 is a deficient number, since it is larger than the sum of its proper divisors (9359062).

18718118 is an equidigital number, since it uses as much as digits as its factorization.

18718118 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9359061.

The product of its digits is 3584, while the sum is 35.

The square root of 18718118 is about 4326.4440363883. Note that the first 3 decimals coincide. The cubic root of 18718118 is about 265.5139805118.

Adding to 18718118 its reverse (81181781), we get a palindrome (99899899).

The spelling of 18718118 in words is "eighteen million, seven hundred eighteen thousand, one hundred eighteen".