228138 has 16 divisors (see below), whose sum is σ = 466560. Its totient is φ = 74336.

The previous prime is 228131. The next prime is 228139. The reversal of 228138 is 831822.

It is not an unprimeable number, because it can be changed into a prime (228131) 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, 123 + ... + 686.

It is an arithmetic number, because the mean of its divisors is an integer number (29160).

2²²⁸¹³⁸ is an apocalyptic number.

228138 is an abundant number, since it is smaller than the sum of its proper divisors (238422).

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

228138 is a wasteful number, since it uses less digits than its factorization.

228138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 861.

The product of its digits is 768, while the sum is 24.

The square root of 228138 is about 477.6379381917. The cubic root of 228138 is about 61.1034703640.

The spelling of 228138 in words is "two hundred twenty-eight thousand, one hundred thirty-eight".