18428 has 12 divisors (see below), whose sum is σ = 34272.
Its totient is φ = 8640.
The previous prime is 18427. The next prime is 18433. The reversal of 18428 is 82481.
It can be divided in two parts, 184 and 28, that added together give a palindrome (212).
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (18427) by changing a digit.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68 + ... + 203.
It is an arithmetic number, because the mean of its divisors is an integer number (2856).
218428 is an apocalyptic number.
It is an amenable number.
18428 is a deficient number, since it is larger than the sum of its proper divisors (15844).
18428 is a wasteful number, since it uses less digits than its factorization.
18428 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 292 (or 290 counting only the distinct ones).
The product of its digits is 512, while the sum is 23.
The square root of 18428 is about 135.7497697972.
The cubic root of 18428 is about 26.4135070154.
The spelling of 18428 in words is "eighteen thousand, four hundred twenty-eight".