16989216 has 48 divisors (see below), whose sum is σ = 45811584. Its totient is φ = 5508864.

The previous prime is 16989199. The next prime is 16989229. The reversal of 16989216 is 61298961.

It is a tau number, because it is divible by the number of its divisors (48).

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1161 + ... + 5943.

It is an arithmetic number, because the mean of its divisors is an integer number (954408).

Almost surely, 2^16989216 is an apocalyptic number.

16989216 is a gapful number since it is divisible by the number (16) 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 16989216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22905792).

16989216 is an abundant number, since it is smaller than the sum of its proper divisors (28822368).

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

16989216 is a wasteful number, since it uses less digits than its factorization.

16989216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4833 (or 4825 counting only the distinct ones).

The product of its digits is 46656, while the sum is 42.

The square root of 16989216 is about 4121.7976660676. The cubic root of 16989216 is about 257.0737775639.

It can be divided in two parts, 16989 and 216, that added together give a triangular number (17205 = T₁₈₅).

The spelling of 16989216 in words is "sixteen million, nine hundred eighty-nine thousand, two hundred sixteen".