6689842 has 4 divisors (see below), whose sum is σ = 10034766. Its totient is φ = 3344920.

The previous prime is 6689821. The next prime is 6689869. The reversal of 6689842 is 2489866.

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 only one way, i.e., 4704561 + 1985281 = 2169^2 + 1409^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1672459 + ... + 1672462.

Almost surely, 2^6689842 is an apocalyptic number.

6689842 is a deficient number, since it is larger than the sum of its proper divisors (3344924).

6689842 is a wasteful number, since it uses less digits than its factorization.

6689842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3344923.

The product of its digits is 165888, while the sum is 43.

The square root of 6689842 is about 2586.4728879306. The cubic root of 6689842 is about 188.4250417862.

The spelling of 6689842 in words is "six million, six hundred eighty-nine thousand, eight hundred forty-two".