228518 has 4 divisors (see below), whose sum is σ = 342780. Its totient is φ = 114258.

The previous prime is 228517. The next prime is 228521. The reversal of 228518 is 815822.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228511) 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 as a sum of consecutive naturals, namely, 57128 + ... + 57131.

It is an arithmetic number, because the mean of its divisors is an integer number (85695).

2²²⁸⁵¹⁸ is an apocalyptic number.

228518 is a deficient number, since it is larger than the sum of its proper divisors (114262).

228518 is a wasteful number, since it uses less digits than its factorization.

228518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114261.

The product of its digits is 1280, while the sum is 26.

The square root of 228518 is about 478.0355635306. The cubic root of 228518 is about 61.1373773835.

The spelling of 228518 in words is "two hundred twenty-eight thousand, five hundred eighteen".