405443 has 4 divisors (see below), whose sum is σ = 407040. Its totient is φ = 403848.

The previous prime is 405439. The next prime is 405473. The reversal of 405443 is 344504.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 405443 - 2² = 405439 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 405443.

It is not an unprimeable number, because it can be changed into a prime (405413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 323 + ... + 956.

It is an arithmetic number, because the mean of its divisors is an integer number (101760).

2⁴⁰⁵⁴⁴³ is an apocalyptic number.

405443 is a deficient number, since it is larger than the sum of its proper divisors (1597).

405443 is a wasteful number, since it uses less digits than its factorization.

405443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1596.

The product of its (nonzero) digits is 960, while the sum is 20.

The square root of 405443 is about 636.7440616135. The cubic root of 405443 is about 74.0133284977.

Adding to 405443 its reverse (344504), we get a palindrome (749947).

It can be divided in two parts, 405 and 443, that added together give a palindrome (848).

The spelling of 405443 in words is "four hundred five thousand, four hundred forty-three".