857965 has 16 divisors (see below), whose sum is σ = 1093680. Its totient is φ = 645120.

The previous prime is 857963. The next prime is 857977. The reversal of 857965 is 569758.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 121801 + 736164 = 349^2 + 858^2 .

It is not a de Polignac number, because 857965 - 2¹ = 857963 is a prime.

It is a super-2 number, since 2×857965² = 1472207882450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (857963) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8797 + ... + 8893.

It is an arithmetic number, because the mean of its divisors is an integer number (68355).

2⁸⁵⁷⁹⁶⁵ is an apocalyptic number.

It is an amenable number.

857965 is a deficient number, since it is larger than the sum of its proper divisors (235715).

857965 is a wasteful number, since it uses less digits than its factorization.

857965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192.

The product of its digits is 75600, while the sum is 40.

The square root of 857965 is about 926.2640012437. The cubic root of 857965 is about 95.0217863238.

The spelling of 857965 in words is "eight hundred fifty-seven thousand, nine hundred sixty-five".