228905 has 8 divisors (see below), whose sum is σ = 290952. Its totient is φ = 172288.

The previous prime is 228901. The next prime is 228911. The reversal of 228905 is 509822.

It can be written as a sum of positive squares in 4 ways, for example, as 38809 + 190096 = 197^2 + 436^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 228905 - 2² = 228901 is a prime.

It is a Duffinian number.

It is a plaindrome in base 9.

It is not an unprimeable number, because it can be changed into a prime (228901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1262 + ... + 1431.

It is an arithmetic number, because the mean of its divisors is an integer number (36369).

2²²⁸⁹⁰⁵ is an apocalyptic number.

It is an amenable number.

228905 is a deficient number, since it is larger than the sum of its proper divisors (62047).

228905 is a wasteful number, since it uses less digits than its factorization.

228905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2715.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 228905 is about 478.4401738985. The cubic root of 228905 is about 61.1718703939.

The spelling of 228905 in words is "two hundred twenty-eight thousand, nine hundred five".