6978847 has 4 divisors (see below), whose sum is σ = 6994576. Its totient is φ = 6963120.

The previous prime is 6978841. The next prime is 6978869. The reversal of 6978847 is 7488796.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6978847 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6978847.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6978841) 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, 7179 + ... + 8092.

It is an arithmetic number, because the mean of its divisors is an integer number (1748644).

Almost surely, 2^6978847 is an apocalyptic number.

6978847 is a deficient number, since it is larger than the sum of its proper divisors (15729).

6978847 is a wasteful number, since it uses less digits than its factorization.

6978847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15728.

The product of its digits is 677376, while the sum is 49.

The square root of 6978847 is about 2641.7507452445. The cubic root of 6978847 is about 191.1002370348.

The spelling of 6978847 in words is "six million, nine hundred seventy-eight thousand, eight hundred forty-seven".