6997840 has 20 divisors (see below), whose sum is σ = 16270164. Its totient is φ = 2799104.

The previous prime is 6997817. The next prime is 6997841. The reversal of 6997840 is 487996.

It can be written as a sum of positive squares in 2 ways, for example, as 4613904 + 2383936 = 2148^2 + 1544^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6997841) 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 3 ways as a sum of consecutive naturals, for example, 43657 + ... + 43816.

Almost surely, 2^6997840 is an apocalyptic number.

It is an amenable number.

6997840 is an abundant number, since it is smaller than the sum of its proper divisors (9272324).

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

6997840 is a wasteful number, since it uses less digits than its factorization.

6997840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87486 (or 87480 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 6997840 is about 2645.3430779390. The cubic root of 6997840 is about 191.2734403895.

The spelling of 6997840 in words is "six million, nine hundred ninety-seven thousand, eight hundred forty".