6840657 has 12 divisors (see below), whose sum is σ = 10068084. Its totient is φ = 4474080.

The previous prime is 6840653. The next prime is 6840661. The reversal of 6840657 is 7560486.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (6840653) and next prime (6840661).

It can be written as a sum of positive squares in 2 ways, for example, as 2005056 + 4835601 = 1416^2 + 2199^2 .

It is not a de Polignac number, because 6840657 - 2² = 6840653 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6840653) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6694 + ... + 7647.

It is an arithmetic number, because the mean of its divisors is an integer number (839007).

Almost surely, 2^6840657 is an apocalyptic number.

It is an amenable number.

6840657 is a deficient number, since it is larger than the sum of its proper divisors (3227427).

6840657 is a wasteful number, since it uses less digits than its factorization.

6840657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14400 (or 14397 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The square root of 6840657 is about 2615.4649682227. The cubic root of 6840657 is about 189.8304766770.

The spelling of 6840657 in words is "six million, eight hundred forty thousand, six hundred fifty-seven".