405543 has 4 divisors (see below), whose sum is σ = 540728. Its totient is φ = 270360.

The previous prime is 405541. The next prime is 405553. The reversal of 405543 is 345504.

It is a happy number.

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

It is not a de Polignac number, because 405543 - 2¹ = 405541 is a prime.

It is a D-number.

It is a Duffinian number.

405543 is a lucky number.

It is a plaindrome in base 13.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 405543.

It is not an unprimeable number, because it can be changed into a prime (405541) 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, 67588 + ... + 67593.

It is an arithmetic number, because the mean of its divisors is an integer number (135182).

2⁴⁰⁵⁵⁴³ is an apocalyptic number.

405543 is a deficient number, since it is larger than the sum of its proper divisors (135185).

405543 is a wasteful number, since it uses less digits than its factorization.

405543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135184.

The product of its (nonzero) digits is 1200, while the sum is 21.

The square root of 405543 is about 636.8225812579. The cubic root of 405543 is about 74.0194129735.

The spelling of 405543 in words is "four hundred five thousand, five hundred forty-three".