228217 has 4 divisors (see below), whose sum is σ = 248976. Its totient is φ = 207460.

The previous prime is 228211. The next prime is 228223. The reversal of 228217 is 712822.

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 an interprime number because it is at equal distance from previous prime (228211) and next prime (228223).

It is not a de Polignac number, because 228217 - 2¹¹ = 226169 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

228217 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (228211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10363 + ... + 10384.

It is an arithmetic number, because the mean of its divisors is an integer number (62244).

2²²⁸²¹⁷ is an apocalyptic number.

It is an amenable number.

228217 is a deficient number, since it is larger than the sum of its proper divisors (20759).

228217 is a wasteful number, since it uses less digits than its factorization.

228217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20758.

The product of its digits is 448, while the sum is 22.

The square root of 228217 is about 477.7206296571. The cubic root of 228217 is about 61.1105225533.

The spelling of 228217 in words is "two hundred twenty-eight thousand, two hundred seventeen".