6805409 has 4 divisors (see below), whose sum is σ = 7328916. Its totient is φ = 6281904.

The previous prime is 6805397. The next prime is 6805411. The reversal of 6805409 is 9045086.

6805409 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 4293184 + 2512225 = 2072^2 + 1585^2 .

It is a cyclic number.

It is not a de Polignac number, because 6805409 - 2¹² = 6801313 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6805429) 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, 261734 + ... + 261759.

It is an arithmetic number, because the mean of its divisors is an integer number (1832229).

Almost surely, 2^6805409 is an apocalyptic number.

It is an amenable number.

6805409 is a deficient number, since it is larger than the sum of its proper divisors (523507).

6805409 is a wasteful number, since it uses less digits than its factorization.

6805409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 523506.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 6805409 is about 2608.7178843256. The cubic root of 6805409 is about 189.5038672013.

The spelling of 6805409 in words is "six million, eight hundred five thousand, four hundred nine".