8422 has 4 divisors (see below), whose sum is σ = 12636.
Its totient is φ = 4210.
The previous prime is 8419. The next prime is 8423. The reversal of 8422 is 2248.
It is a semiprime because it is the product of two primes.
It is a plaindrome in base 13.
It is a nialpdrome in base 10.
It is a junction number, because it is equal to n+sod(n) for n = 8396 and 8405.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (8423) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2104 + ... + 2107.
It is an arithmetic number, because the mean of its divisors is an integer number (3159).
28422 is an apocalyptic number.
8422 is a deficient number, since it is larger than the sum of its proper divisors (4214).
8422 is a wasteful number, since it uses less digits than its factorization.
8422 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 4213.
The product of its digits is 128, while the sum is 16.
The square root of 8422 is about 91.7714552571.
The cubic root of 8422 is about 20.3456582688.
The spelling of 8422 in words is "eight thousand, four hundred twenty-two".