6888981 has 16 divisors (see below), whose sum is σ = 10119168. Its totient is φ = 4134000.

The previous prime is 6888971. The next prime is 6888989. The reversal of 6888981 is 1898886.

It is not a de Polignac number, because 6888981 - 2¹¹ = 6886933 is a prime.

It is a super-2 number, since 2×6888981² = 94916118436722, which contains 22 as substring.

It is an Ulam number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 6888981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6888989) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 2556 + ... + 4506.

It is an arithmetic number, because the mean of its divisors is an integer number (632448).

Almost surely, 2^6888981 is an apocalyptic number.

It is an amenable number.

6888981 is a deficient number, since it is larger than the sum of its proper divisors (3230187).

6888981 is a wasteful number, since it uses less digits than its factorization.

6888981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2072.

The product of its digits is 221184, while the sum is 48.

The square root of 6888981 is about 2624.6868384628. The cubic root of 6888981 is about 190.2764304986.

It can be divided in two parts, 688 and 8981, that added together give a palindrome (9669).

The spelling of 6888981 in words is "six million, eight hundred eighty-eight thousand, nine hundred eighty-one".