18911016 has 64 divisors (see below), whose sum is σ = 54360000. Its totient is φ = 6084288.

The previous prime is 18911003. The next prime is 18911017. The reversal of 18911016 is 61011981.

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

It is not an unprimeable number, because it can be changed into a prime (18911017) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4755 + ... + 7773.

It is an arithmetic number, because the mean of its divisors is an integer number (849375).

Almost surely, 2^18911016 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 18911016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27180000).

18911016 is an abundant number, since it is smaller than the sum of its proper divisors (35448984).

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

18911016 is a wasteful number, since it uses less digits than its factorization.

18911016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3063 (or 3053 counting only the distinct ones).

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

The square root of 18911016 is about 4348.6797996633. The cubic root of 18911016 is about 266.4229425903.

Adding to 18911016 its reverse (61011981), we get a palindrome (79922997).

The spelling of 18911016 in words is "eighteen million, nine hundred eleven thousand, sixteen".