16686216 has 64 divisors (see below), whose sum is σ = 47083200. Its totient is φ = 5474304.

The previous prime is 16686211. The next prime is 16686217. The reversal of 16686216 is 61268661.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (16686211) 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 15 ways as a sum of consecutive naturals, for example, 13896 + ... + 15048.

It is an arithmetic number, because the mean of its divisors is an integer number (735675).

Almost surely, 2^16686216 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 16686216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23541600).

16686216 is an abundant number, since it is smaller than the sum of its proper divisors (30396984).

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

16686216 is a wasteful number, since it uses less digits than its factorization.

16686216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1235 (or 1225 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 16686216 is about 4084.8764975211. The cubic root of 16686216 is about 255.5363106981.

The spelling of 16686216 in words is "sixteen million, six hundred eighty-six thousand, two hundred sixteen".