423421 has 6 divisors (see below), whose sum is σ = 435390. Its totient is φ = 411768.

The previous prime is 423413. The next prime is 423427. The reversal of 423421 is 124324.

It can be written as a sum of positive squares in only one way, i.e., 416025 + 7396 = 645^2 + 86^2 .

It is not a de Polignac number, because 423421 - 2³ = 423413 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 423395 and 423404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (423427) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1735 + ... + 1963.

It is an arithmetic number, because the mean of its divisors is an integer number (72565).

2⁴²³⁴²¹ is an apocalyptic number.

It is an amenable number.

423421 is a deficient number, since it is larger than the sum of its proper divisors (11969).

423421 is an equidigital number, since it uses as much as digits as its factorization.

423421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315 (or 272 counting only the distinct ones).

The product of its digits is 192, while the sum is 16.

The square root of 423421 is about 650.7080758681. The cubic root of 423421 is about 75.0915031318.

Adding to 423421 its reverse (124324), we get a palindrome (547745).

The spelling of 423421 in words is "four hundred twenty-three thousand, four hundred twenty-one", and thus it is an iban number.