6809947 has 4 divisors (see below), whose sum is σ = 6911656. Its totient is φ = 6708240.

The previous prime is 6809927. The next prime is 6809981. The reversal of 6809947 is 7499086.

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

It is a cyclic number.

It is not a de Polignac number, because 6809947 - 2¹⁹ = 6285659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6809927) 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, 50754 + ... + 50887.

It is an arithmetic number, because the mean of its divisors is an integer number (1727914).

Almost surely, 2^6809947 is an apocalyptic number.

6809947 is a gapful number since it is divisible by the number (67) formed by its first and last digit.

6809947 is a deficient number, since it is larger than the sum of its proper divisors (101709).

6809947 is a wasteful number, since it uses less digits than its factorization.

6809947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101708.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 6809947 is about 2609.5875152982. The cubic root of 6809947 is about 189.5459796578.

The spelling of 6809947 in words is "six million, eight hundred nine thousand, nine hundred forty-seven".