18008111 has 8 divisors (see below), whose sum is σ = 19764864. Its totient is φ = 16271320.

The previous prime is 18008093. The next prime is 18008113. The reversal of 18008111 is 11180081.

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

It is a cyclic number.

It is not a de Polignac number, because 18008111 - 2¹⁸ = 17745967 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18008113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3065 + ... + 6738.

It is an arithmetic number, because the mean of its divisors is an integer number (2470608).

Almost surely, 2^18008111 is an apocalyptic number.

18008111 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

18008111 is a deficient number, since it is larger than the sum of its proper divisors (1756753).

18008111 is a wasteful number, since it uses less digits than its factorization.

18008111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9981.

The product of its (nonzero) digits is 64, while the sum is 20.

The square root of 18008111 is about 4243.5964699769. The cubic root of 18008111 is about 262.1134980161.

Adding to 18008111 its reverse (11180081), we get a palindrome (29188192).

It can be divided in two parts, 180081 and 11, that multiplied together give a palindrome (1980891).

The spelling of 18008111 in words is "eighteen million, eight thousand, one hundred eleven".