2857867 has 2 divisors, whose sum is σ = 2857868. Its totient is φ = 2857866.

The previous prime is 2857861. The next prime is 2857889. The reversal of 2857867 is 7687582.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2857867 - 2¹¹ = 2855819 is a prime.

It is not a weakly prime, because it can be changed into another prime (2857861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1428933 + 1428934.

It is an arithmetic number, because the mean of its divisors is an integer number (1428934).

2^2857867 is an apocalyptic number.

2857867 is a deficient number, since it is larger than the sum of its proper divisors (1).

2857867 is an equidigital number, since it uses as much as digits as its factorization.

2857867 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 188160, while the sum is 43.

The square root of 2857867 is about 1690.5227002321. The cubic root of 2857867 is about 141.9103282292.

The spelling of 2857867 in words is "two million, eight hundred fifty-seven thousand, eight hundred sixty-seven".