18918108 has 108 divisors (see below), whose sum is σ = 54318264. Its totient is φ = 5544000.

The previous prime is 18918101. The next prime is 18918139. The reversal of 18918108 is 80181981.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18918101) 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 35 ways as a sum of consecutive naturals, for example, 187258 + ... + 187358.

Almost surely, 2^18918108 is an apocalyptic number.

18918108 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18918108, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27159132).

18918108 is an abundant number, since it is smaller than the sum of its proper divisors (35400156).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18918108 is a wasteful number, since it uses less digits than its factorization.

18918108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176 (or 160 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 36.

The square root of 18918108 is about 4349.4951431172. The cubic root of 18918108 is about 266.4562430285.

It can be divided in two parts, 1891 and 8108, that added together give a palindrome (9999).

The spelling of 18918108 in words is "eighteen million, nine hundred eighteen thousand, one hundred eight".