2857897 has 4 divisors (see below), whose sum is σ = 3266176. Its totient is φ = 2449620.

The previous prime is 2857891. The next prime is 2857903. The reversal of 2857897 is 7987582.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7987582 = 2 ⋅3993791.

It is an interprime number because it is at equal distance from previous prime (2857891) and next prime (2857903).

It is a cyclic number.

It is not a de Polignac number, because 2857897 - 2³ = 2857889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2857891) 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 in 3 ways as a sum of consecutive naturals, for example, 204129 + ... + 204142.

It is an arithmetic number, because the mean of its divisors is an integer number (816544).

2^2857897 is an apocalyptic number.

It is an amenable number.

2857897 is a deficient number, since it is larger than the sum of its proper divisors (408279).

2857897 is an equidigital number, since it uses as much as digits as its factorization.

2857897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408278.

The product of its digits is 282240, while the sum is 46.

The square root of 2857897 is about 1690.5315732041. The cubic root of 2857897 is about 141.9108247878.

The spelling of 2857897 in words is "two million, eight hundred fifty-seven thousand, eight hundred ninety-seven".