420171 has 4 divisors (see below), whose sum is σ = 560232. Its totient is φ = 280112.

The previous prime is 420163. The next prime is 420191. The reversal of 420171 is 171024.

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

It is a cyclic number.

It is not a de Polignac number, because 420171 - 2³ = 420163 is a prime.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 420171.

It is not an unprimeable number, because it can be changed into a prime (420191) 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, 70026 + ... + 70031.

It is an arithmetic number, because the mean of its divisors is an integer number (140058).

2⁴²⁰¹⁷¹ is an apocalyptic number.

420171 is a deficient number, since it is larger than the sum of its proper divisors (140061).

420171 is a wasteful number, since it uses less digits than its factorization.

420171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140060.

The product of its (nonzero) digits is 56, while the sum is 15.

The square root of 420171 is about 648.2059857792. The cubic root of 420171 is about 74.8988859628.

Adding to 420171 its reverse (171024), we get a palindrome (591195).

The spelling of 420171 in words is "four hundred twenty thousand, one hundred seventy-one", and thus it is an iban number.