18718018 has 16 divisors (see below), whose sum is σ = 30854880. Its totient is φ = 8445600.

The previous prime is 18718009. The next prime is 18718019. The reversal of 18718018 is 81081781.

It is not an unprimeable number, because it can be changed into a prime (18718019) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3 + ... + 6118.

It is an arithmetic number, because the mean of its divisors is an integer number (1928430).

Almost surely, 2^18718018 is an apocalyptic number.

18718018 is a deficient number, since it is larger than the sum of its proper divisors (12136862).

18718018 is a wasteful number, since it uses less digits than its factorization.

18718018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6273.

The product of its (nonzero) digits is 3584, while the sum is 34.

The square root of 18718018 is about 4326.4324795378. The cubic root of 18718018 is about 265.5135076821.

Adding to 18718018 its reverse (81081781), we get a palindrome (99799799).

It can be divided in two parts, 1871 and 8018, that added together give a palindrome (9889).

The spelling of 18718018 in words is "eighteen million, seven hundred eighteen thousand, eighteen".