2840857 has 2 divisors, whose sum is σ = 2840858. Its totient is φ = 2840856.

The previous prime is 2840801. The next prime is 2840911. The reversal of 2840857 is 7580482.

2840857 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1485961 + 1354896 = 1219^2 + 1164^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2840857 is a prime.

It is not a weakly prime, because it can be changed into another prime (2840657) 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 as a sum of consecutive naturals, namely, 1420428 + 1420429.

It is an arithmetic number, because the mean of its divisors is an integer number (1420429).

2^2840857 is an apocalyptic number.

It is an amenable number.

2840857 is a deficient number, since it is larger than the sum of its proper divisors (1).

2840857 is an equidigital number, since it uses as much as digits as its factorization.

2840857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17920, while the sum is 34.

The square root of 2840857 is about 1685.4842034264. The cubic root of 2840857 is about 141.6282180934.

The spelling of 2840857 in words is "two million, eight hundred forty thousand, eight hundred fifty-seven".