228173 has 4 divisors (see below), whose sum is σ = 248928. Its totient is φ = 207420.

The previous prime is 228139. The next prime is 228181. The reversal of 228173 is 371822.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 228173 - 2¹⁴ = 211789 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228103) 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, 10361 + ... + 10382.

It is an arithmetic number, because the mean of its divisors is an integer number (62232).

2²²⁸¹⁷³ is an apocalyptic number.

It is an amenable number.

228173 is a deficient number, since it is larger than the sum of its proper divisors (20755).

228173 is a wasteful number, since it uses less digits than its factorization.

228173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20754.

The product of its digits is 672, while the sum is 23.

The square root of 228173 is about 477.6745754172. The cubic root of 228173 is about 61.1065949525.

Subtracting from 228173 its sum of digits (23), we obtain a triangular number (228150 = T₆₇₅).

Adding to 228173 its reverse (371822), we get a palindrome (599995).

The spelling of 228173 in words is "two hundred twenty-eight thousand, one hundred seventy-three".