228489 has 4 divisors (see below), whose sum is σ = 304656. Its totient is φ = 152324.
The previous prime is 228479. The next prime is 228509. The reversal of 228489 is 984822.
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 228489 - 25 = 228457 is a prime.
It is a D-number.
It is a Curzon number.
It is not an unprimeable number, because it can be changed into a prime (228409) 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, 38079 + ... + 38084.
It is an arithmetic number, because the mean of its divisors is an integer number (76164).
2228489 is an apocalyptic number.
It is an amenable number.
228489 is a deficient number, since it is larger than the sum of its proper divisors (76167).
228489 is an equidigital number, since it uses as much as digits as its factorization.
228489 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 76166.
The product of its digits is 9216, while the sum is 33.
The square root of 228489 is about 478.0052300969. The cubic root of 228489 is about 61.1347910679.
Adding to 228489 its product of digits (9216), we get a triangular number (237705 = T689).
It can be divided in two parts, 228 and 489, that added together give a palindrome (717).
The spelling of 228489 in words is "two hundred twenty-eight thousand, four hundred eighty-nine".
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