2857243 has 4 divisors (see below), whose sum is σ = 2875600. Its totient is φ = 2838888.

The previous prime is 2857237. The next prime is 2857247. The reversal of 2857243 is 3427582.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3427582 = 2 ⋅1713791.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2857243 is a prime.

It is a super-3 number, since 3×2857243³ = 69978203173332983721, which contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a d-powerful number, because it can be written as 2 + 8 + 5⁹ + 7⁶ + 2¹⁹ + 4⁹ + 3³ .

It is a Duffinian number.

2857243 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2857247) 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, 8943 + ... + 9256.

It is an arithmetic number, because the mean of its divisors is an integer number (718900).

2^2857243 is an apocalyptic number.

2857243 is a deficient number, since it is larger than the sum of its proper divisors (18357).

2857243 is a wasteful number, since it uses less digits than its factorization.

2857243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18356.

The product of its digits is 13440, while the sum is 31.

The square root of 2857243 is about 1690.3381318541. The cubic root of 2857243 is about 141.8999990233.

The spelling of 2857243 in words is "two million, eight hundred fifty-seven thousand, two hundred forty-three".