857864 has 16 divisors (see below), whose sum is σ = 1838400. Its totient is φ = 367632.

The previous prime is 857851. The next prime is 857867. The reversal of 857864 is 468758.

It is a super-4 number, since 4×857864⁴ (a number of 25 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (857867) by changing a digit.

857864 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7604 + ... + 7715.

It is an arithmetic number, because the mean of its divisors is an integer number (114900).

2⁸⁵⁷⁸⁶⁴ is an apocalyptic number.

It is an amenable number.

857864 is an abundant number, since it is smaller than the sum of its proper divisors (980536).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

857864 is a wasteful number, since it uses less digits than its factorization.

857864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15332 (or 15328 counting only the distinct ones).

The product of its digits is 53760, while the sum is 38.

The square root of 857864 is about 926.2094795455. The cubic root of 857864 is about 95.0180575093.

The spelling of 857864 in words is "eight hundred fifty-seven thousand, eight hundred sixty-four".