16383865 has 4 divisors (see below), whose sum is σ = 19660644. Its totient is φ = 13107088.

The previous prime is 16383839. The next prime is 16383877. The reversal of 16383865 is 56838361.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56838361 = 17 ⋅3343433.

It can be written as a sum of positive squares in 2 ways, for example, as 5234944 + 11148921 = 2288^2 + 3339^2 .

It is a cyclic number.

It is not a de Polignac number, because 16383865 - 2⁷ = 16383737 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1638382 + ... + 1638391.

It is an arithmetic number, because the mean of its divisors is an integer number (4915161).

Almost surely, 2^16383865 is an apocalyptic number.

It is an amenable number.

16383865 is a deficient number, since it is larger than the sum of its proper divisors (3276779).

16383865 is an equidigital number, since it uses as much as digits as its factorization.

16383865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3276778.

The product of its digits is 103680, while the sum is 40.

The square root of 16383865 is about 4047.6987289076. The cubic root of 16383865 is about 253.9834707246.

The spelling of 16383865 in words is "sixteen million, three hundred eighty-three thousand, eight hundred sixty-five".