400171 has 4 divisors (see below), whose sum is σ = 414000. Its totient is φ = 386344.

The previous prime is 400157. The next prime is 400187. The reversal of 400171 is 171004.

400171 = 20² + 21² + ... + 106².

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400171 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400151) 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, 6871 + ... + 6928.

It is an arithmetic number, because the mean of its divisors is an integer number (103500).

2⁴⁰⁰¹⁷¹ is an apocalyptic number.

400171 is a deficient number, since it is larger than the sum of its proper divisors (13829).

400171 is a wasteful number, since it uses less digits than its factorization.

400171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13828.

The product of its (nonzero) digits is 28, while the sum is 13.

The square root of 400171 is about 632.5907049586. The cubic root of 400171 is about 73.6911279668.

Adding to 400171 its reverse (171004), we get a palindrome (571175).

The spelling of 400171 in words is "four hundred thousand, one hundred seventy-one", and thus it is an iban number.