171939 has 8 divisors (see below), whose sum is σ = 235600. Its totient is φ = 111456.

The previous prime is 171937. The next prime is 171947. The reversal of 171939 is 939171.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 171939 - 2¹ = 171937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (171937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is an upside-down number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 664 + ... + 885.

It is an arithmetic number, because the mean of its divisors is an integer number (29450).

2¹⁷¹⁹³⁹ is an apocalyptic number.

171939 is the 222-nd nonagonal number.

171939 is a deficient number, since it is larger than the sum of its proper divisors (63661).

171939 is a wasteful number, since it uses less digits than its factorization.

171939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1589.

The product of its digits is 1701, while the sum is 30.

The square root of 171939 is about 414.6552785146. The cubic root of 171939 is about 55.6064024855.

The spelling of 171939 in words is "one hundred seventy-one thousand, nine hundred thirty-nine".