6981805 has 8 divisors (see below), whose sum is σ = 8393112. Its totient is φ = 5575488.

The previous prime is 6981791. The next prime is 6981823. The reversal of 6981805 is 5081896.

It can be written as a sum of positive squares in 4 ways, for example, as 443556 + 6538249 = 666^2 + 2557^2 .

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 6981805 - 2¹³ = 6973613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3447 + ... + 5083.

It is an arithmetic number, because the mean of its divisors is an integer number (1049139).

Almost surely, 2^6981805 is an apocalyptic number.

It is an amenable number.

6981805 is a deficient number, since it is larger than the sum of its proper divisors (1411307).

6981805 is a wasteful number, since it uses less digits than its factorization.

6981805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2495.

The product of its (nonzero) digits is 17280, while the sum is 37.

The square root of 6981805 is about 2642.3105419311. The cubic root of 6981805 is about 191.1272326429.

The spelling of 6981805 in words is "six million, nine hundred eighty-one thousand, eight hundred five".