Multipling 40401 by its product of nonzero digits (16), we get a square (646416 = 8042).
Adding to 40401 its reverse (10404), we get a palindrome (50805).
Multipling 40401 by its reverse (10404), we get a square (420332004 = 205022).
The square root of 40401 is 201.
It is a tau number, because it is divible by the number of its divisors (9).
It is a de Polignac number, because none of the positive numbers 2k-40401 is a prime.
It is a Curzon number.
240401 is an apocalyptic number.
40401 is the 201-st square number.
40401 is the 101-st centered octagonal number.
It is an amenable number.
40401 is an equidigital number, since it uses as much as digits as its factorization.
40401 is an odious number, because the sum of its binary digits is odd.
The cubic root of 40401 is about 34.3134225418.
The spelling of 40401 in words is "forty thousand, four hundred one", and thus it is an iban number.