19881108 has 72 divisors (see below), whose sum is σ = 56504448. Its totient is φ = 5848128.

The previous prime is 19881101. The next prime is 19881133. The reversal of 19881108 is 80118891.

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 (19881101) 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 23 ways as a sum of consecutive naturals, for example, 9841 + ... + 11687.

It is an arithmetic number, because the mean of its divisors is an integer number (784784).

Almost surely, 2^19881108 is an apocalyptic number.

19881108 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 19881108, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28252224).

19881108 is an abundant number, since it is smaller than the sum of its proper divisors (36623340).

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

19881108 is a wasteful number, since it uses less digits than its factorization.

19881108 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1893 (or 1888 counting only the distinct ones).

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

The square root of 19881108 is about 4458.8236116716. The cubic root of 19881108 is about 270.9028214177.

Adding to 19881108 its reverse (80118891), we get a palindrome (99999999).

The spelling of 19881108 in words is "nineteen million, eight hundred eighty-one thousand, one hundred eight".