443421 has 16 divisors (see below), whose sum is σ = 717120. Its totient is φ = 268560.

The previous prime is 443419. The next prime is 443423. The reversal of 443421 is 124344.

It is an interprime number because it is at equal distance from previous prime (443419) and next prime (443423).

It is not a de Polignac number, because 443421 - 2¹ = 443419 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 443394 and 443403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (443423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 450 + ... + 1043.

It is an arithmetic number, because the mean of its divisors is an integer number (44820).

2⁴⁴³⁴²¹ is an apocalyptic number.

It is an amenable number.

443421 is a deficient number, since it is larger than the sum of its proper divisors (273699).

443421 is a wasteful number, since it uses less digits than its factorization.

443421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1513 (or 1507 counting only the distinct ones).

The product of its digits is 384, while the sum is 18.

The square root of 443421 is about 665.8986409357. The cubic root of 443421 is about 76.2556602445.

Adding to 443421 its reverse (124344), we get a palindrome (567765).

The spelling of 443421 in words is "four hundred forty-three thousand, four hundred twenty-one", and thus it is an iban number.