228385 has 4 divisors (see below), whose sum is σ = 274068. Its totient is φ = 182704.

The previous prime is 228383. The next prime is 228409. The reversal of 228385 is 583822.

228385 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 150544 + 77841 = 388^2 + 279^2 .

It is a cyclic number.

It is not a de Polignac number, because 228385 - 2¹ = 228383 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (228383) 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, 22834 + ... + 22843.

It is an arithmetic number, because the mean of its divisors is an integer number (68517).

2²²⁸³⁸⁵ is an apocalyptic number.

It is an amenable number.

228385 is a deficient number, since it is larger than the sum of its proper divisors (45683).

228385 is an equidigital number, since it uses as much as digits as its factorization.

228385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45682.

The product of its digits is 3840, while the sum is 28.

The square root of 228385 is about 477.8964322947. The cubic root of 228385 is about 61.1255142054.

The spelling of 228385 in words is "two hundred twenty-eight thousand, three hundred eighty-five".