6689923 has 8 divisors (see below), whose sum is σ = 6961680. Its totient is φ = 6420960.

The previous prime is 6689909. The next prime is 6689971. The reversal of 6689923 is 3299866.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6689923 is a prime.

It is a Duffinian number.

6689923 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 6689923.

It is not an unprimeable number, because it can be changed into a prime (6689323) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5128 + ... + 6298.

It is an arithmetic number, because the mean of its divisors is an integer number (870210).

Almost surely, 2^6689923 is an apocalyptic number.

6689923 is a deficient number, since it is larger than the sum of its proper divisors (271757).

6689923 is a wasteful number, since it uses less digits than its factorization.

6689923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1397.

The product of its digits is 139968, while the sum is 43.

The square root of 6689923 is about 2586.4885462727. The cubic root of 6689923 is about 188.4258022609.

The spelling of 6689923 in words is "six million, six hundred eighty-nine thousand, nine hundred twenty-three".