6978857 has 8 divisors (see below), whose sum is σ = 7562016. Its totient is φ = 6414912.

The previous prime is 6978841. The next prime is 6978869. The reversal of 6978857 is 7588796.

It is a happy number.

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

It is not a de Polignac number, because 6978857 - 2⁴ = 6978841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6978877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4043 + ... + 5504.

It is an arithmetic number, because the mean of its divisors is an integer number (945252).

Almost surely, 2^6978857 is an apocalyptic number.

It is an amenable number.

6978857 is a deficient number, since it is larger than the sum of its proper divisors (583159).

6978857 is a wasteful number, since it uses less digits than its factorization.

6978857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9607.

The product of its digits is 846720, while the sum is 50.

The square root of 6978857 is about 2641.7526379281. The cubic root of 6978857 is about 191.1003283107.

The spelling of 6978857 in words is "six million, nine hundred seventy-eight thousand, eight hundred fifty-seven".