406321 has 4 divisors (see below), whose sum is σ = 413044. Its totient is φ = 399600.

The previous prime is 406313. The next prime is 406327. The reversal of 406321 is 123604.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 190096 + 216225 = 436^2 + 465^2 .

It is a cyclic number.

It is not a de Polignac number, because 406321 - 2³ = 406313 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 406295 and 406304.

It is not an unprimeable number, because it can be changed into a prime (406327) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3270 + ... + 3391.

It is an arithmetic number, because the mean of its divisors is an integer number (103261).

2⁴⁰⁶³²¹ is an apocalyptic number.

It is an amenable number.

406321 is a deficient number, since it is larger than the sum of its proper divisors (6723).

406321 is an equidigital number, since it uses as much as digits as its factorization.

406321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6722.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 406321 is about 637.4331337482. The cubic root of 406321 is about 74.0667160685.

Adding to 406321 its reverse (123604), we get a palindrome (529925).

It can be divided in two parts, 406 and 321, that added together give a palindrome (727).

The spelling of 406321 in words is "four hundred six thousand, three hundred twenty-one".