228213 has 6 divisors (see below), whose sum is σ = 329654. Its totient is φ = 152136.

The previous prime is 228211. The next prime is 228223. The reversal of 228213 is 312822.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 178929 + 49284 = 423^2 + 222^2 .

It is not a de Polignac number, because 228213 - 2¹ = 228211 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 (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 5 ways as a sum of consecutive naturals, for example, 12670 + ... + 12687.

2²²⁸²¹³ is an apocalyptic number.

It is an amenable number.

228213 is a deficient number, since it is larger than the sum of its proper divisors (101441).

228213 is a wasteful number, since it uses less digits than its factorization.

228213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25363 (or 25360 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 228213 is about 477.7164430915. The cubic root of 228213 is about 61.1101655195.

It can be divided in two parts, 228 and 213, that added together give a square (441 = 21²).

The spelling of 228213 in words is "two hundred twenty-eight thousand, two hundred thirteen".