18938108 has 36 divisors (see below), whose sum is σ = 40238352. Its totient is φ = 7761600.

The previous prime is 18938107. The next prime is 18938123. The reversal of 18938108 is 80183981.

It is a nialpdrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18938107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2408 + ... + 6608.

It is an arithmetic number, because the mean of its divisors is an integer number (1117732).

Almost surely, 2^18938108 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18938108, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20119176).

18938108 is an abundant number, since it is smaller than the sum of its proper divisors (21300244).

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

18938108 is a wasteful number, since it uses less digits than its factorization.

18938108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4242 (or 4233 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 38.

The square root of 18938108 is about 4351.7936531963. The cubic root of 18938108 is about 266.5501080881.

It can be divided in two parts, 1893 and 8108, that added together give a palindrome (10001).

The spelling of 18938108 in words is "eighteen million, nine hundred thirty-eight thousand, one hundred eight".