6821140 has 12 divisors (see below), whose sum is σ = 14324436. Its totient is φ = 2728448.

The previous prime is 6821117. The next prime is 6821141. The reversal of 6821140 is 411286.

6821140 is nontrivially palindromic in base 6.

It can be written as a sum of positive squares in 2 ways, for example, as 5447556 + 1373584 = 2334^2 + 1172^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6821141) 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, 170509 + ... + 170548.

It is an arithmetic number, because the mean of its divisors is an integer number (1193703).

Almost surely, 2^6821140 is an apocalyptic number.

It is an amenable number.

6821140 is an abundant number, since it is smaller than the sum of its proper divisors (7503296).

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

6821140 is a wasteful number, since it uses less digits than its factorization.

6821140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341066 (or 341064 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 6821140 is about 2611.7312266005. The cubic root of 6821140 is about 189.6497703258.

The spelling of 6821140 in words is "six million, eight hundred twenty-one thousand, one hundred forty".