6805639 has 2 divisors, whose sum is σ = 6805640. Its totient is φ = 6805638.

The previous prime is 6805621. The next prime is 6805649. The reversal of 6805639 is 9365086.

6805639 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 6805639 - 2⁵ = 6805607 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 6805598 and 6805607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6805609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3402819 + 3402820.

It is an arithmetic number, because the mean of its divisors is an integer number (3402820).

Almost surely, 2^6805639 is an apocalyptic number.

6805639 is a deficient number, since it is larger than the sum of its proper divisors (1).

6805639 is an equidigital number, since it uses as much as digits as its factorization.

6805639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 6805639 is about 2608.7619669107. The cubic root of 6805639 is about 189.5060020423.

The spelling of 6805639 in words is "six million, eight hundred five thousand, six hundred thirty-nine".