6981879 has 4 divisors (see below), whose sum is σ = 9309176. Its totient is φ = 4654584.

The previous prime is 6981859. The next prime is 6981889. The reversal of 6981879 is 9781896.

It is a happy number.

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

It is not a de Polignac number, because 6981879 - 2⁵ = 6981847 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6981829) 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 3 ways as a sum of consecutive naturals, for example, 1163644 + ... + 1163649.

It is an arithmetic number, because the mean of its divisors is an integer number (2327294).

Almost surely, 2^6981879 is an apocalyptic number.

6981879 is a deficient number, since it is larger than the sum of its proper divisors (2327297).

6981879 is a wasteful number, since it uses less digits than its factorization.

6981879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2327296.

The product of its digits is 217728, while the sum is 48.

The square root of 6981879 is about 2642.3245447901. The cubic root of 6981879 is about 191.1279078916.

The spelling of 6981879 in words is "six million, nine hundred eighty-one thousand, eight hundred seventy-nine".