18922 has 4 divisors (see below), whose sum is σ = 28386.
Its totient is φ = 9460.
The previous prime is 18919. The next prime is 18947. The reversal of 18922 is 22981.
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., 14161 + 4761 = 119^2 + 69^2
It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.
It is a plaindrome in base 6.
It is a junction number, because it is equal to n+sod(n) for n = 18893 and 18902.
It is an unprimeable number.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4729 + ... + 4732.
218922 is an apocalyptic number.
18922 is a deficient number, since it is larger than the sum of its proper divisors (9464).
18922 is an equidigital number, since it uses as much as digits as its factorization.
18922 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 9463.
The product of its digits is 288, while the sum is 22.
The square root of 18922 is about 137.5572608044.
The cubic root of 18922 is about 26.6474514352.
The spelling of 18922 in words is "eighteen thousand, nine hundred twenty-two".