18621108 has 72 divisors (see below), whose sum is σ = 52284960. Its totient is φ = 5540160.

The previous prime is 18621091. The next prime is 18621139. The reversal of 18621108 is 80112681.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 22966 + ... + 23762.

It is an arithmetic number, because the mean of its divisors is an integer number (726180).

Almost surely, 2^18621108 is an apocalyptic number.

18621108 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 18621108, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26142480).

18621108 is an abundant number, since it is smaller than the sum of its proper divisors (33663852).

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

18621108 is a wasteful number, since it uses less digits than its factorization.

18621108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 877 (or 872 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 27.

The square root of 18621108 is about 4315.2181868360. The cubic root of 18621108 is about 265.0544945483.

Adding to 18621108 its reverse (80112681), we get a palindrome (98733789).

It can be divided in two parts, 18 and 621108, that added together give a palindrome (621126).

The spelling of 18621108 in words is "eighteen million, six hundred twenty-one thousand, one hundred eight".