6689929 has 4 divisors (see below), whose sum is σ = 6853140. Its totient is φ = 6526720.

The previous prime is 6689909. The next prime is 6689971. The reversal of 6689929 is 9299866.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1827904 + 4862025 = 1352^2 + 2205^2 .

It is a cyclic number.

It is not a de Polignac number, because 6689929 - 2⁷ = 6689801 is a prime.

It is a Duffinian number.

6689929 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6689909) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81544 + ... + 81625.

It is an arithmetic number, because the mean of its divisors is an integer number (1713285).

Almost surely, 2^6689929 is an apocalyptic number.

It is an amenable number.

6689929 is a deficient number, since it is larger than the sum of its proper divisors (163211).

6689929 is a wasteful number, since it uses less digits than its factorization.

6689929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163210.

The product of its digits is 419904, while the sum is 49.

The square root of 6689929 is about 2586.4897061462. The cubic root of 6689929 is about 188.4258585922.

The spelling of 6689929 in words is "six million, six hundred eighty-nine thousand, nine hundred twenty-nine".