6909439 has 2 divisors, whose sum is σ = 6909440. Its totient is φ = 6909438.

The previous prime is 6909437. The next prime is 6909449. The reversal of 6909439 is 9349096.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6909439 - 2¹ = 6909437 is a prime.

Together with 6909437, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6909437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3454719 + 3454720.

It is an arithmetic number, because the mean of its divisors is an integer number (3454720).

Almost surely, 2^6909439 is an apocalyptic number.

6909439 is a deficient number, since it is larger than the sum of its proper divisors (1).

6909439 is an equidigital number, since it uses as much as digits as its factorization.

6909439 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 52488, while the sum is 40.

The square root of 6909439 is about 2628.5811762242. The cubic root of 6909439 is about 190.4645970910.

The spelling of 6909439 in words is "six million, nine hundred nine thousand, four hundred thirty-nine".