2857865 has 8 divisors (see below), whose sum is σ = 3578688. Its totient is φ = 2186800.

The previous prime is 2857861. The next prime is 2857867. The reversal of 2857865 is 5687582.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2857865 - 2² = 2857861 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2857861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12311 + ... + 12540.

It is an arithmetic number, because the mean of its divisors is an integer number (447336).

2^2857865 is an apocalyptic number.

It is an amenable number.

2857865 is a deficient number, since it is larger than the sum of its proper divisors (720823).

2857865 is a wasteful number, since it uses less digits than its factorization.

2857865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24879.

The product of its digits is 134400, while the sum is 41.

The square root of 2857865 is about 1690.5221086990. The cubic root of 2857865 is about 141.9102951252.

The spelling of 2857865 in words is "two million, eight hundred fifty-seven thousand, eight hundred sixty-five".