2857945 has 4 divisors (see below), whose sum is σ = 3429540. Its totient is φ = 2286352.

The previous prime is 2857937. The next prime is 2857949. The reversal of 2857945 is 5497582.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1792921 + 1065024 = 1339^2 + 1032^2 .

It is a cyclic number.

It is not a de Polignac number, because 2857945 - 2³ = 2857937 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 2857898 and 2857907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2857949) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 285790 + ... + 285799.

It is an arithmetic number, because the mean of its divisors is an integer number (857385).

2^2857945 is an apocalyptic number.

It is an amenable number.

2857945 is a deficient number, since it is larger than the sum of its proper divisors (571595).

2857945 is an equidigital number, since it uses as much as digits as its factorization.

2857945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 571594.

The product of its digits is 100800, while the sum is 40.

The square root of 2857945 is about 1690.5457698625. The cubic root of 2857945 is about 141.9116192743.

The spelling of 2857945 in words is "two million, eight hundred fifty-seven thousand, nine hundred forty-five".