16440865 has 16 divisors (see below), whose sum is σ = 22975488. Its totient is φ = 11059776.

The previous prime is 16440857. The next prime is 16440869. The reversal of 16440865 is 56804461.

It is not a de Polignac number, because 16440865 - 2³ = 16440857 is a prime.

It is a super-3 number, since 3×16440865³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16440865.

It is not an unprimeable number, because it can be changed into a prime (16440869) 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, 2577 + ... + 6286.

It is an arithmetic number, because the mean of its divisors is an integer number (1435968).

Almost surely, 2^16440865 is an apocalyptic number.

It is an amenable number.

16440865 is a deficient number, since it is larger than the sum of its proper divisors (6534623).

16440865 is an equidigital number, since it uses as much as digits as its factorization.

16440865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8928.

The product of its (nonzero) digits is 23040, while the sum is 34.

The square root of 16440865 is about 4054.7336533982. The cubic root of 16440865 is about 254.2776687356.

The spelling of 16440865 in words is "sixteen million, four hundred forty thousand, eight hundred sixty-five".