16440816 has 80 divisors (see below), whose sum is σ = 48996864. Its totient is φ = 4653312.

The previous prime is 16440811. The next prime is 16440829. The reversal of 16440816 is 61804461.

It is a super-3 number, since 3×16440816³ (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16440811) 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, 55966 + ... + 56258.

Almost surely, 2^16440816 is an apocalyptic number.

16440816 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 16440816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24498432).

16440816 is an abundant number, since it is smaller than the sum of its proper divisors (32556048).

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

16440816 is a wasteful number, since it uses less digits than its factorization.

16440816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 478 (or 472 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 16440816 is about 4054.7276110733. The cubic root of 16440816 is about 254.2774161208.

The spelling of 16440816 in words is "sixteen million, four hundred forty thousand, eight hundred sixteen".