6817947389 has 4 divisors (see below), whose sum is σ = 7437760800. Its totient is φ = 6198133980.

The previous prime is 6817947377. The next prime is 6817947391. The reversal of 6817947389 is 9837497186.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6817947389 - 2⁸ = 6817947133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6817947989) 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, 309906689 + ... + 309906710.

It is an arithmetic number, because the mean of its divisors is an integer number (1859440200).

Almost surely, 2^6817947389 is an apocalyptic number.

It is an amenable number.

6817947389 is a deficient number, since it is larger than the sum of its proper divisors (619813411).

6817947389 is a wasteful number, since it uses less digits than its factorization.

6817947389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 619813410.

The product of its digits is 18289152, while the sum is 62.

The square root of 6817947389 is about 82570.8628330842. The cubic root of 6817947389 is about 1896.2017740192.

The spelling of 6817947389 in words is "six billion, eight hundred seventeen million, nine hundred forty-seven thousand, three hundred eighty-nine".