16320865 has 32 divisors (see below), whose sum is σ = 22404096. Its totient is φ = 11309760.

The previous prime is 16320809. The next prime is 16320919. The reversal of 16320865 is 56802361.

It is a de Polignac number, because none of the positive numbers 2^k-16320865 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 158404 + ... + 158506.

It is an arithmetic number, because the mean of its divisors is an integer number (700128).

Almost surely, 2^16320865 is an apocalyptic number.

It is an amenable number.

16320865 is a deficient number, since it is larger than the sum of its proper divisors (6083231).

16320865 is a wasteful number, since it uses less digits than its factorization.

16320865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 16320865 is about 4039.9090336293. The cubic root of 16320865 is about 253.6575095470.

The spelling of 16320865 in words is "sixteen million, three hundred twenty thousand, eight hundred sixty-five".