399171 has 16 divisors (see below), whose sum is σ = 576000. Its totient is φ = 245088.

The previous prime is 399163. The next prime is 399173. The reversal of 399171 is 171993.

399171 is nontrivially palindromic in base 2 and base 7.

399171 is a nontrivial binomial coefficient, being equal to C(894, 2).

It is not a de Polignac number, because 399171 - 2³ = 399163 is a prime.

It is not an unprimeable number, because it can be changed into a prime (399173) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2605 + ... + 2753.

It is an arithmetic number, because the mean of its divisors is an integer number (36000).

2³⁹⁹¹⁷¹ is an apocalyptic number.

399171 is the 893-rd triangular number and also the 447-th hexagonal number.

399171 is a deficient number, since it is larger than the sum of its proper divisors (176829).

399171 is a wasteful number, since it uses less digits than its factorization.

399171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218.

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

The square root of 399171 is about 631.7998100664. The cubic root of 399171 is about 73.6296937329.

The spelling of 399171 in words is "three hundred ninety-nine thousand, one hundred seventy-one".