6840857 has 2 divisors, whose sum is σ = 6840858. Its totient is φ = 6840856.

The previous prime is 6840811. The next prime is 6840871. The reversal of 6840857 is 7580486.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4682896 + 2157961 = 2164^2 + 1469^2 .

It is a cyclic number.

It is not a de Polignac number, because 6840857 - 2⁶ = 6840793 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6840857.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6840157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3420428 + 3420429.

It is an arithmetic number, because the mean of its divisors is an integer number (3420429).

Almost surely, 2^6840857 is an apocalyptic number.

It is an amenable number.

6840857 is a deficient number, since it is larger than the sum of its proper divisors (1).

6840857 is an equidigital number, since it uses as much as digits as its factorization.

6840857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 53760, while the sum is 38.

The square root of 6840857 is about 2615.5032020627. The cubic root of 6840857 is about 189.8323266809.

The spelling of 6840857 in words is "six million, eight hundred forty thousand, eight hundred fifty-seven".