6697840 has 40 divisors (see below), whose sum is σ = 16115040. Its totient is φ = 2585856.

The previous prime is 6697837. The next prime is 6697841. The reversal of 6697840 is 487966.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×6697840² = 89722121331200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 6697793 and 6697802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6697841) 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 7 ways as a sum of consecutive naturals, for example, 877 + ... + 3763.

It is an arithmetic number, because the mean of its divisors is an integer number (402876).

Almost surely, 2^6697840 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6697840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8057520).

6697840 is an abundant number, since it is smaller than the sum of its proper divisors (9417200).

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

6697840 is a wasteful number, since it uses less digits than its factorization.

6697840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2929 (or 2923 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 6697840 is about 2588.0185470742. The cubic root of 6697840 is about 188.5001020199.

The spelling of 6697840 in words is "six million, six hundred ninety-seven thousand, eight hundred forty".