6408865 has 4 divisors (see below), whose sum is σ = 7690644. Its totient is φ = 5127088.

The previous prime is 6408859. The next prime is 6408869. The reversal of 6408865 is 5688046.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2934369 + 3474496 = 1713^2 + 1864^2 .

It is a cyclic number.

It is not a de Polignac number, because 6408865 - 2¹⁹ = 5884577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6408869) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 640882 + ... + 640891.

It is an arithmetic number, because the mean of its divisors is an integer number (1922661).

Almost surely, 2^6408865 is an apocalyptic number.

It is an amenable number.

6408865 is a deficient number, since it is larger than the sum of its proper divisors (1281779).

6408865 is a wasteful number, since it uses less digits than its factorization.

6408865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1281778.

The product of its (nonzero) digits is 46080, while the sum is 37.

The square root of 6408865 is about 2531.5736212878. The cubic root of 6408865 is about 185.7492381382.

The spelling of 6408865 in words is "six million, four hundred eight thousand, eight hundred sixty-five".