171996 has 24 divisors (see below), whose sum is σ = 438144. Its totient is φ = 52080.

The previous prime is 171947. The next prime is 172001. The reversal of 171996 is 699171.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an unprimeable number.

171996 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 7 ways as a sum of consecutive naturals, for example, 520 + ... + 783.

It is an arithmetic number, because the mean of its divisors is an integer number (18256).

2¹⁷¹⁹⁹⁶ is an apocalyptic number.

It is an amenable number.

171996 is an abundant number, since it is smaller than the sum of its proper divisors (266148).

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

171996 is a wasteful number, since it uses less digits than its factorization.

171996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1321 (or 1319 counting only the distinct ones).

The product of its digits is 3402, while the sum is 33.

The square root of 171996 is about 414.7240046103. The cubic root of 171996 is about 55.6125465535.

It can be divided in two parts, 17199 and 6, that added together give a triangular number (17205 = T₁₈₅).

The spelling of 171996 in words is "one hundred seventy-one thousand, nine hundred ninety-six".