80018 has 4 divisors (see below), whose sum is σ = 120030.
Its totient is φ = 40008.
The previous prime is 79999. The next prime is 80021. The reversal of 80018 is 81008.
Subtracting 80018 from its reverse (81008), we obtain a triangular number (990 = T44).
It can be divided in two parts, 800 and 18, that multiplied together give a square (14400 = 1202).
It is a happy number.
It is a semiprime because it is the product of two primes.
It can be written as a sum of positive squares in only one way, i.e., 41209 + 38809 = 203^2 + 197^2
80018 is a modest number, since divided by 18 gives 8 as remainder.
It is a junction number, because it is equal to n+sod(n) for n = 79978 and 80005.
It is an unprimeable number.
80018 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
It is a pernicious number, because its binary representation contains a prime number (7) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20003 + ... + 20006.
280018 is an apocalyptic number.
80018 is a deficient number, since it is larger than the sum of its proper divisors (40012).
80018 is a wasteful number, since it uses less digits than its factorization.
80018 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 40011.
The product of its (nonzero) digits is 64, while the sum is 17.
The square root of 80018 is about 282.8745304901.
The cubic root of 80018 is about 43.0919252103.
The spelling of 80018 in words is "eighty thousand, eighteen".