6816865 has 16 divisors (see below), whose sum is σ = 9144576. Its totient is φ = 4835200.

The previous prime is 6816853. The next prime is 6816871. The reversal of 6816865 is 5686186.

It is a happy number.

It is not a de Polignac number, because 6816865 - 2⁷ = 6816737 is a prime.

It is a Duffinian number.

6816865 is a lucky number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 744 + ... + 3766.

It is an arithmetic number, because the mean of its divisors is an integer number (571536).

Almost surely, 2^6816865 is an apocalyptic number.

It is an amenable number.

6816865 is a deficient number, since it is larger than the sum of its proper divisors (2327711).

6816865 is a wasteful number, since it uses less digits than its factorization.

6816865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3080.

The product of its digits is 69120, while the sum is 40.

The square root of 6816865 is about 2610.9126756749. The cubic root of 6816865 is about 189.6101424337.

The spelling of 6816865 in words is "six million, eight hundred sixteen thousand, eight hundred sixty-five".