6981440 has 28 divisors (see below), whose sum is σ = 16625316. Its totient is φ = 2792448.

The previous prime is 6981433. The next prime is 6981449. The reversal of 6981440 is 441896.

6981440 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 3625216 + 3356224 = 1904^2 + 1832^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 6981397 and 6981406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6981449) 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, 10589 + ... + 11228.

Almost surely, 2^6981440 is an apocalyptic number.

It is an amenable number.

6981440 is an abundant number, since it is smaller than the sum of its proper divisors (9643876).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6981440 is a wasteful number, since it uses less digits than its factorization.

6981440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21834 (or 21824 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 6981440 is about 2642.2414726894. The cubic root of 6981440 is about 191.1239019542.

The spelling of 6981440 in words is "six million, nine hundred eighty-one thousand, four hundred forty".