It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 104402 = 2 ⋅52201.
It is a cyclic number.
It is a Duffinian number.
It is a Curzon number.
2204401 is an apocalyptic number.
It is an amenable number.
204401 is an equidigital number, since it uses as much as digits as its factorization.
204401 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 8910.
The square root of 204401 is about 452.1072881518. The cubic root of 204401 is about 58.9061997023.
Adding to 204401 its reverse (104402), we get a palindrome (308803).
Subtracting from 204401 its reverse (104402), we obtain a palindrome (99999).
The spelling of 204401 in words is "two hundred four thousand, four hundred one", and thus it is an iban number.