6840340 has 24 divisors (see below), whose sum is σ = 15470280. Its totient is φ = 2525568.

The previous prime is 6840331. The next prime is 6840349. The reversal of 6840340 is 430486.

It is an interprime number because it is at equal distance from previous prime (6840331) and next prime (6840349).

It can be written as a sum of positive squares in 4 ways, for example, as 101124 + 6739216 = 318^2 + 2596^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6840349) 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 7 ways as a sum of consecutive naturals, for example, 12895 + ... + 13414.

It is an arithmetic number, because the mean of its divisors is an integer number (644595).

Almost surely, 2^6840340 is an apocalyptic number.

It is an amenable number.

6840340 is an abundant number, since it is smaller than the sum of its proper divisors (8629940).

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

6840340 is a wasteful number, since it uses less digits than its factorization.

6840340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26331 (or 26329 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 6840340 is about 2615.4043664413. The cubic root of 6840340 is about 189.8275443471.

The spelling of 6840340 in words is "six million, eight hundred forty thousand, three hundred forty".