6826409 has 2 divisors, whose sum is σ = 6826410. Its totient is φ = 6826408.

The previous prime is 6826403. The next prime is 6826411. The reversal of 6826409 is 9046286.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5895184 + 931225 = 2428^2 + 965^2 .

It is a cyclic number.

It is not a de Polignac number, because 6826409 - 2²⁰ = 5777833 is a prime.

Together with 6826411, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (6826403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3413204 + 3413205.

It is an arithmetic number, because the mean of its divisors is an integer number (3413205).

Almost surely, 2^6826409 is an apocalyptic number.

It is an amenable number.

6826409 is a deficient number, since it is larger than the sum of its proper divisors (1).

6826409 is an equidigital number, since it uses as much as digits as its factorization.

6826409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 6826409 is about 2612.7397497646. The cubic root of 6826409 is about 189.6985895093.

The spelling of 6826409 in words is "six million, eight hundred twenty-six thousand, four hundred nine".