170823 has 4 divisors (see below), whose sum is σ = 227768. Its totient is φ = 113880.

The previous prime is 170813. The next prime is 170827. The reversal of 170823 is 328071.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 328071 = 3 ⋅109357.

It is not a de Polignac number, because 170823 - 2⁶ = 170759 is a prime.

It is a D-number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 170823.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (170827) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28468 + ... + 28473.

It is an arithmetic number, because the mean of its divisors is an integer number (56942).

2¹⁷⁰⁸²³ is an apocalyptic number.

170823 is a deficient number, since it is larger than the sum of its proper divisors (56945).

170823 is an equidigital number, since it uses as much as digits as its factorization.

170823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56944.

The product of its (nonzero) digits is 336, while the sum is 21.

The square root of 170823 is about 413.3073916590. The cubic root of 170823 is about 55.4858335729.

Adding to 170823 its reverse (328071), we get a palindrome (498894).

The spelling of 170823 in words is "one hundred seventy thousand, eight hundred twenty-three".