6718939 has 2 divisors, whose sum is σ = 6718940. Its totient is φ = 6718938.

The previous prime is 6718937. The next prime is 6718963. The reversal of 6718939 is 9398176.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6718939 - 2¹ = 6718937 is a prime.

Together with 6718937, it forms a pair of twin primes.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 6718895 and 6718904.

It is not a weakly prime, because it can be changed into another prime (6718937) 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, 3359469 + 3359470.

It is an arithmetic number, because the mean of its divisors is an integer number (3359470).

Almost surely, 2^6718939 is an apocalyptic number.

6718939 is a deficient number, since it is larger than the sum of its proper divisors (1).

6718939 is an equidigital number, since it uses as much as digits as its factorization.

6718939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648, while the sum is 43.

The square root of 6718939 is about 2592.0916264669. The cubic root of 6718939 is about 188.6978271953.

The spelling of 6718939 in words is "six million, seven hundred eighteen thousand, nine hundred thirty-nine".