18911106 has 48 divisors (see below), whose sum is σ = 45287424. Its totient is φ = 5672832.

The previous prime is 18911071. The next prime is 18911111. The reversal of 18911106 is 60111981.

It is a self number, because there is not a number n which added to its sum of digits gives 18911106.

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, 5695 + ... + 8381.

It is an arithmetic number, because the mean of its divisors is an integer number (943488).

Almost surely, 2^18911106 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18911106, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22643712).

18911106 is an abundant number, since it is smaller than the sum of its proper divisors (26376318).

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

18911106 is a wasteful number, since it uses less digits than its factorization.

18911106 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2735 (or 2732 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 27.

The square root of 18911106 is about 4348.6901476192. The cubic root of 18911106 is about 266.4233652368.

The spelling of 18911106 in words is "eighteen million, nine hundred eleven thousand, one hundred six".