857543 has 4 divisors (see below), whose sum is σ = 862968. Its totient is φ = 852120.

The previous prime is 857539. The next prime is 857551. The reversal of 857543 is 345758.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 857543 - 2² = 857539 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (857513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2468 + ... + 2793.

It is an arithmetic number, because the mean of its divisors is an integer number (215742).

2⁸⁵⁷⁵⁴³ is an apocalyptic number.

857543 is a deficient number, since it is larger than the sum of its proper divisors (5425).

857543 is a wasteful number, since it uses less digits than its factorization.

857543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5424.

The product of its digits is 16800, while the sum is 32.

The square root of 857543 is about 926.0361763992. The cubic root of 857543 is about 95.0062045809.

The spelling of 857543 in words is "eight hundred fifty-seven thousand, five hundred forty-three".