6840081 has 12 divisors (see below), whose sum is σ = 9912708. Its totient is φ = 4545024.

The previous prime is 6840073. The next prime is 6840083. The reversal of 6840081 is 1800486.

It can be written as a sum of positive squares in 2 ways, for example, as 1476225 + 5363856 = 1215^2 + 2316^2 .

It is not a de Polignac number, because 6840081 - 2³ = 6840073 is a prime.

It is a super-2 number, since 2×6840081² = 93573416173122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6840083) 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 11 ways as a sum of consecutive naturals, for example, 2101 + ... + 4253.

It is an arithmetic number, because the mean of its divisors is an integer number (826059).

Almost surely, 2^6840081 is an apocalyptic number.

It is an amenable number.

6840081 is a deficient number, since it is larger than the sum of its proper divisors (3072627).

6840081 is a wasteful number, since it uses less digits than its factorization.

6840081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2512 (or 2509 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 6840081 is about 2615.3548516406. The cubic root of 6840081 is about 189.8251484645.

The spelling of 6840081 in words is "six million, eight hundred forty thousand, eighty-one".