6818840 has 80 divisors (see below), whose sum is σ = 18150480. Its totient is φ = 2304960.

The previous prime is 6818839. The next prime is 6818843. The reversal of 6818840 is 488186.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a nialpdrome in base 14.

It is a self number, because there is not a number n which added to its sum of digits gives 6818840.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6818843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 96005 + ... + 96075.

It is an arithmetic number, because the mean of its divisors is an integer number (226881).

Almost surely, 2^6818840 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 6818840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9075240).

6818840 is an abundant number, since it is smaller than the sum of its proper divisors (11331640).

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

6818840 is an equidigital number, since it uses as much as digits as its factorization.

6818840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110 (or 85 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 35.

The square root of 6818840 is about 2611.2908685169. The cubic root of 6818840 is about 189.6284521148.

The spelling of 6818840 in words is "six million, eight hundred eighteen thousand, eight hundred forty".