42173 has 4 divisors (see below), whose sum is σ = 42588. Its totient is φ = 41760.

The previous prime is 42169. The next prime is 42179. The reversal of 42173 is 37124.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 3364 + 38809 = 58^2 + 197^2 .

It is a cyclic number.

It is not a de Polignac number, because 42173 - 2² = 42169 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42179) 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, 65 + ... + 297.

It is an arithmetic number, because the mean of its divisors is an integer number (10647).

2⁴²¹⁷³ is an apocalyptic number.

It is an amenable number.

42173 is a deficient number, since it is larger than the sum of its proper divisors (415).

42173 is a wasteful number, since it uses less digits than its factorization.

42173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414.

The product of its digits is 168, while the sum is 17.

The square root of 42173 is about 205.3606583550. The cubic root of 42173 is about 34.8079274669.

Adding to 42173 its reverse (37124), we get a palindrome (79297).

It can be divided in two parts, 421 and 73, that added together give a palindrome (494).

The spelling of 42173 in words is "forty-two thousand, one hundred seventy-three", and thus it is an iban number.