857523 has 4 divisors (see below), whose sum is σ = 1143368. Its totient is φ = 571680.

The previous prime is 857513. The next prime is 857539. The reversal of 857523 is 325758.

It is a happy number.

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

It is not a de Polignac number, because 857523 - 2⁶ = 857459 is a prime.

It is a D-number.

It is a Duffinian 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, 142918 + ... + 142923.

It is an arithmetic number, because the mean of its divisors is an integer number (285842).

2⁸⁵⁷⁵²³ is an apocalyptic number.

857523 is a deficient number, since it is larger than the sum of its proper divisors (285845).

857523 is a wasteful number, since it uses less digits than its factorization.

857523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285844.

The product of its digits is 8400, while the sum is 30.

The square root of 857523 is about 926.0253776220. The cubic root of 857523 is about 95.0054659828.

The spelling of 857523 in words is "eight hundred fifty-seven thousand, five hundred twenty-three".