16440216 has 128 divisors (see below), whose sum is σ = 48384000. Its totient is φ = 4612608.

The previous prime is 16440209. The next prime is 16440217. The reversal of 16440216 is 61204461.

It is a super-3 number, since 3×16440216³ (a number of 23 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16440217) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 208065 + ... + 208143.

It is an arithmetic number, because the mean of its divisors is an integer number (378000).

Almost surely, 2^16440216 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 16440216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24192000).

16440216 is an abundant number, since it is smaller than the sum of its proper divisors (31943784).

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

16440216 is a wasteful number, since it uses less digits than its factorization.

16440216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153 (or 149 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 16440216 is about 4054.6536226908. The cubic root of 16440216 is about 254.2743228375.

Adding to 16440216 its reverse (61204461), we get a palindrome (77644677).

The spelling of 16440216 in words is "sixteen million, four hundred forty thousand, two hundred sixteen".