6686969 has 4 divisors (see below), whose sum is σ = 6725796. Its totient is φ = 6648144.

The previous prime is 6686947. The next prime is 6686983. The reversal of 6686969 is 9696866.

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 3312400 + 3374569 = 1820^2 + 1837^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6686969 is a prime.

It is a super-2 number, since 2×6686969² = 89431108813922, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6686909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19154 + ... + 19499.

It is an arithmetic number, because the mean of its divisors is an integer number (1681449).

Almost surely, 2^6686969 is an apocalyptic number.

It is an amenable number.

6686969 is a deficient number, since it is larger than the sum of its proper divisors (38827).

6686969 is a wasteful number, since it uses less digits than its factorization.

6686969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38826.

The product of its digits is 839808, while the sum is 50.

The square root of 6686969 is about 2585.9174387439. The cubic root of 6686969 is about 188.3980644347.

The spelling of 6686969 in words is "six million, six hundred eighty-six thousand, nine hundred sixty-nine".