228918 has 8 divisors (see below), whose sum is σ = 457848. Its totient is φ = 76304.

The previous prime is 228913. The next prime is 228923. The reversal of 228918 is 819822.

It is an interprime number because it is at equal distance from previous prime (228913) and next prime (228923).

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

228918 is an admirable 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 (228911) by changing a digit.

228918 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19071 + ... + 19082.

It is an arithmetic number, because the mean of its divisors is an integer number (57231).

2²²⁸⁹¹⁸ is an apocalyptic number.

228918 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

228918 is a wasteful number, since it uses less digits than its factorization.

228918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38158.

The product of its digits is 2304, while the sum is 30.

The square root of 228918 is about 478.4537595212. The cubic root of 228918 is about 61.1730283987.

It can be divided in two parts, 2 and 28918, that added together give a triangular number (28920 = T₂₄₀).

The spelling of 228918 in words is "two hundred twenty-eight thousand, nine hundred eighteen".