228985 has 8 divisors (see below), whose sum is σ = 281736. Its totient is φ = 178560.

The previous prime is 228983. The next prime is 228989. The reversal of 228985 is 589822.

It can be written as a sum of positive squares in 4 ways, for example, as 13689 + 215296 = 117^2 + 464^2 .

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

It is not a de Polignac number, because 228985 - 2¹ = 228983 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 228985.

It is not an unprimeable number, because it can be changed into a prime (228983) 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 7 ways as a sum of consecutive naturals, for example, 354 + ... + 763.

It is an arithmetic number, because the mean of its divisors is an integer number (35217).

2²²⁸⁹⁸⁵ is an apocalyptic number.

It is an amenable number.

228985 is a deficient number, since it is larger than the sum of its proper divisors (52751).

228985 is a wasteful number, since it uses less digits than its factorization.

228985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1163.

The product of its digits is 11520, while the sum is 34.

The square root of 228985 is about 478.5237716143. The cubic root of 228985 is about 61.1789958821.

It can be divided in two parts, 2 and 28985, that multiplied together give a triangular number (57970 = T₃₄₀).

The spelling of 228985 in words is "two hundred twenty-eight thousand, nine hundred eighty-five".