6981818 has 8 divisors (see below), whose sum is σ = 10565748. Its totient is φ = 3459904.

The previous prime is 6981791. The next prime is 6981823. The reversal of 6981818 is 8181896.

It can be written as a sum of positive squares in 2 ways, for example, as 5987809 + 994009 = 2447^2 + 997^2 .

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

It is an alternating number because its digits alternate between even and odd.

6981818 is a modest number, since divided by 1818 gives 698 as remainder.

It is a Curzon 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 3 ways as a sum of consecutive naturals, for example, 15221 + ... + 15672.

Almost surely, 2^6981818 is an apocalyptic number.

6981818 is a deficient number, since it is larger than the sum of its proper divisors (3583930).

6981818 is a wasteful number, since it uses less digits than its factorization.

6981818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31008.

The product of its digits is 27648, while the sum is 41.

The square root of 6981818 is about 2642.3130018981. The cubic root of 6981818 is about 191.1273512680.

The spelling of 6981818 in words is "six million, nine hundred eighty-one thousand, eight hundred eighteen".