6689723 has 2 divisors, whose sum is σ = 6689724. Its totient is φ = 6689722.

The previous prime is 6689719. The next prime is 6689741. The reversal of 6689723 is 3279866.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6689723 - 2² = 6689719 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (6689773) 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, 3344861 + 3344862.

It is an arithmetic number, because the mean of its divisors is an integer number (3344862).

Almost surely, 2^6689723 is an apocalyptic number.

6689723 is a deficient number, since it is larger than the sum of its proper divisors (1).

6689723 is an equidigital number, since it uses as much as digits as its factorization.

6689723 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 41.

The square root of 6689723 is about 2586.4498835276. The cubic root of 6689723 is about 188.4239245345.

The spelling of 6689723 in words is "six million, six hundred eighty-nine thousand, seven hundred twenty-three".