18117108 has 96 divisors (see below), whose sum is σ = 50512000. Its totient is φ = 5668704.

The previous prime is 18117101. The next prime is 18117119. The reversal of 18117108 is 80171181.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18117101) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 166158 + ... + 166266.

Almost surely, 2^18117108 is an apocalyptic number.

18117108 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 18117108, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25256000).

18117108 is an abundant number, since it is smaller than the sum of its proper divisors (32394892).

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

18117108 is a wasteful number, since it uses less digits than its factorization.

18117108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153 (or 133 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 27.

The square root of 18117108 is about 4256.4196221707. The cubic root of 18117108 is about 262.6412627422.

Adding to 18117108 its reverse (80171181), we get a palindrome (98288289).

It can be divided in two parts, 18117 and 108, that added together give a square (18225 = 135²).

The spelling of 18117108 in words is "eighteen million, one hundred seventeen thousand, one hundred eight".