18812 has 6 divisors (see below), whose sum is σ = 32928. Its totient is φ = 9404.
The previous prime is 18803. The next prime is 18839. The reversal of 18812 is 21881.
It is a nialpdrome in base 13.
It is a zygodrome in base 5.
It is a congruent number.
It is an unprimeable number.
18812 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 as a sum of consecutive naturals, namely, 2348 + ... + 2355.
It is an arithmetic number, because the mean of its divisors is an integer number (5488).
218812 is an apocalyptic number.
It is an amenable number.
18812 is a deficient number, since it is larger than the sum of its proper divisors (14116).
18812 is a wasteful number, since it uses less digits than its factorization.
18812 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 4707 (or 4705 counting only the distinct ones).
The product of its digits is 128, while the sum is 20.
The square root of 18812 is about 137.1568445248. The cubic root of 18812 is about 26.5957141605.
The spelling of 18812 in words is "eighteen thousand, eight hundred twelve".
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