857005 has 4 divisors (see below), whose sum is σ = 1028412. Its totient is φ = 685600.

The previous prime is 856993. The next prime is 857009. The reversal of 857005 is 500758.

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 443556 + 413449 = 666^2 + 643^2 .

It is not a de Polignac number, because 857005 - 2¹¹ = 854957 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 (857009) 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, 85696 + ... + 85705.

It is an arithmetic number, because the mean of its divisors is an integer number (257103).

2⁸⁵⁷⁰⁰⁵ is an apocalyptic number.

It is an amenable number.

857005 is a deficient number, since it is larger than the sum of its proper divisors (171407).

857005 is a wasteful number, since it uses less digits than its factorization.

857005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171406.

The product of its (nonzero) digits is 1400, while the sum is 25.

The square root of 857005 is about 925.7456454124. The cubic root of 857005 is about 94.9863322904.

The spelling of 857005 in words is "eight hundred fifty-seven thousand, five".