6865865 has 4 divisors (see below), whose sum is σ = 8239044. Its totient is φ = 5492688.

The previous prime is 6865861. The next prime is 6865867. The reversal of 6865865 is 5685686.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5685686 = 2 ⋅2842843.

It can be written as a sum of positive squares in 2 ways, for example, as 1408969 + 5456896 = 1187^2 + 2336^2 .

It is a cyclic number.

It is not a de Polignac number, because 6865865 - 2² = 6865861 is a prime.

It is a super-3 number, since 3×6865865³ (a number of 21 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6865861) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 686582 + ... + 686591.

It is an arithmetic number, because the mean of its divisors is an integer number (2059761).

Almost surely, 2^6865865 is an apocalyptic number.

It is an amenable number.

6865865 is a deficient number, since it is larger than the sum of its proper divisors (1373179).

6865865 is a wasteful number, since it uses less digits than its factorization.

6865865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1373178.

The product of its digits is 345600, while the sum is 44.

The square root of 6865865 is about 2620.2795652373. The cubic root of 6865865 is about 190.0633675987.

The spelling of 6865865 in words is "six million, eight hundred sixty-five thousand, eight hundred sixty-five".