6391947 has 8 divisors (see below), whose sum is σ = 8539344. Its totient is φ = 4252928.

The previous prime is 6391939. The next prime is 6391963. The reversal of 6391947 is 7491936.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6391947 - 2³ = 6391939 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6391927) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18 + ... + 3575.

It is an arithmetic number, because the mean of its divisors is an integer number (1067418).

Almost surely, 2^6391947 is an apocalyptic number.

6391947 is a deficient number, since it is larger than the sum of its proper divisors (2147397).

6391947 is a wasteful number, since it uses less digits than its factorization.

6391947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4189.

The product of its digits is 40824, while the sum is 39.

The square root of 6391947 is about 2528.2300132702. The cubic root of 6391947 is about 185.5856483372.

The spelling of 6391947 in words is "six million, three hundred ninety-one thousand, nine hundred forty-seven".