2857643 has 2 divisors, whose sum is σ = 2857644. Its totient is φ = 2857642.

The previous prime is 2857639. The next prime is 2857661. The reversal of 2857643 is 3467582.

Added to its reverse (3467582) it gives a square (6325225 = 2515²).

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2857643 - 2² = 2857639 is a prime.

It is a super-2 number, since 2×2857643² = 16332247030898, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2857633) 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, 1428821 + 1428822.

It is an arithmetic number, because the mean of its divisors is an integer number (1428822).

2^2857643 is an apocalyptic number.

2857643 is a deficient number, since it is larger than the sum of its proper divisors (1).

2857643 is an equidigital number, since it uses as much as digits as its factorization.

2857643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40320, while the sum is 35.

The square root of 2857643 is about 1690.4564472355. The cubic root of 2857643 is about 141.9066204822.

Adding to 2857643 its reverse (3467582), we get a square (6325225 = 2515²).

The spelling of 2857643 in words is "two million, eight hundred fifty-seven thousand, six hundred forty-three".