422721 has 12 divisors (see below), whose sum is σ = 657748. Its totient is φ = 260064.

The previous prime is 422711. The next prime is 422749. The reversal of 422721 is 127224.

422721 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 18225 + 404496 = 135^2 + 636^2 .

It is not a de Polignac number, because 422721 - 2⁵ = 422689 is a prime.

422721 is strictly pandigital in base 7.

It is a junction number, because it is equal to n+sod(n) for n = 422694 and 422703.

It is not an unprimeable number, because it can be changed into a prime (422701) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1690 + ... + 1923.

2⁴²²⁷²¹ is an apocalyptic number.

It is an amenable number.

422721 is a deficient number, since it is larger than the sum of its proper divisors (235027).

422721 is a wasteful number, since it uses less digits than its factorization.

422721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3632 (or 3629 counting only the distinct ones).

The product of its digits is 224, while the sum is 18.

The square root of 422721 is about 650.1699777750. The cubic root of 422721 is about 75.0500998593.

Adding to 422721 its reverse (127224), we get a palindrome (549945).

The spelling of 422721 in words is "four hundred twenty-two thousand, seven hundred twenty-one", and thus it is an iban number.