171868 has 6 divisors (see below), whose sum is σ = 300776. Its totient is φ = 85932.

The previous prime is 171863. The next prime is 171869. The reversal of 171868 is 868171.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (171863) 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 as a sum of consecutive naturals, namely, 21480 + ... + 21487.

2¹⁷¹⁸⁶⁸ is an apocalyptic number.

It is an amenable number.

171868 is a deficient number, since it is larger than the sum of its proper divisors (128908).

171868 is a wasteful number, since it uses less digits than its factorization.

171868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42971 (or 42969 counting only the distinct ones).

The product of its digits is 2688, while the sum is 31.

The square root of 171868 is about 414.5696563908. The cubic root of 171868 is about 55.5987474486.

The spelling of 171868 in words is "one hundred seventy-one thousand, eight hundred sixty-eight".