6885409 has 2 divisors, whose sum is σ = 6885410. Its totient is φ = 6885408.

The previous prime is 6885407. The next prime is 6885413. The reversal of 6885409 is 9045886.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4635409 + 2250000 = 2153^2 + 1500^2 .

It is a cyclic number.

It is not a de Polignac number, because 6885409 - 2¹ = 6885407 is a prime.

Together with 6885407, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (6885401) by changing a digit.

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 as a sum of consecutive naturals, namely, 3442704 + 3442705.

It is an arithmetic number, because the mean of its divisors is an integer number (3442705).

Almost surely, 2^6885409 is an apocalyptic number.

It is an amenable number.

6885409 is a deficient number, since it is larger than the sum of its proper divisors (1).

6885409 is an equidigital number, since it uses as much as digits as its factorization.

6885409 is an odious number, because the sum of its binary digits is odd.

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

The square root of 6885409 is about 2624.0062881022. The cubic root of 6885409 is about 190.2435381199.

The spelling of 6885409 in words is "six million, eight hundred eighty-five thousand, four hundred nine".