16440016 has 40 divisors (see below), whose sum is σ = 34372800. Its totient is φ = 7591680.

The previous prime is 16440007. The next prime is 16440019. The reversal of 16440016 is 61004461.

It is a nialpdrome in base 8.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16440019) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11805 + ... + 13123.

It is an arithmetic number, because the mean of its divisors is an integer number (859320).

Almost surely, 2^16440016 is an apocalyptic number.

16440016 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 16440016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17186400).

16440016 is an abundant number, since it is smaller than the sum of its proper divisors (17932784).

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

16440016 is a wasteful number, since it uses less digits than its factorization.

16440016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1387 (or 1381 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 16440016 is about 4054.6289595967. The cubic root of 16440016 is about 254.2732917264.

Adding to 16440016 its reverse (61004461), we get a palindrome (77444477).

The spelling of 16440016 in words is "sixteen million, four hundred forty thousand, sixteen".