857913 has 8 divisors (see below), whose sum is σ = 1307328. Its totient is φ = 490224.

The previous prime is 857903. The next prime is 857929. The reversal of 857913 is 319758.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 857913 - 2⁴ = 857897 is a prime.

857913 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (857903) 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 7 ways as a sum of consecutive naturals, for example, 20406 + ... + 20447.

It is an arithmetic number, because the mean of its divisors is an integer number (163416).

2⁸⁵⁷⁹¹³ is an apocalyptic number.

It is an amenable number.

857913 is a deficient number, since it is larger than the sum of its proper divisors (449415).

857913 is a wasteful number, since it uses less digits than its factorization.

857913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40863.

The product of its digits is 7560, while the sum is 33.

The square root of 857913 is about 926.2359310672. The cubic root of 857913 is about 95.0198665746.

It can be divided in two parts, 857 and 913, that added together give a triangular number (1770 = T₅₉).

The spelling of 857913 in words is "eight hundred fifty-seven thousand, nine hundred thirteen".