857955 has 16 divisors (see below), whose sum is σ = 1569024. Its totient is φ = 392160.

The previous prime is 857953. The next prime is 857957. The reversal of 857955 is 559758.

It is an interprime number because it is at equal distance from previous prime (857953) and next prime (857957).

It is not a de Polignac number, because 857955 - 2¹ = 857953 is a prime.

857955 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (857951) 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 15 ways as a sum of consecutive naturals, for example, 3981 + ... + 4190.

It is an arithmetic number, because the mean of its divisors is an integer number (98064).

2⁸⁵⁷⁹⁵⁵ is an apocalyptic number.

857955 is a deficient number, since it is larger than the sum of its proper divisors (711069).

857955 is a wasteful number, since it uses less digits than its factorization.

857955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8186.

The product of its digits is 63000, while the sum is 39.

The square root of 857955 is about 926.2586031989. The cubic root of 857955 is about 95.0214171473.

The spelling of 857955 in words is "eight hundred fifty-seven thousand, nine hundred fifty-five".