406543 has 4 divisors (see below), whose sum is σ = 427960. Its totient is φ = 385128.

The previous prime is 406531. The next prime is 406547. The reversal of 406543 is 345604.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-406543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (406547) 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, 10680 + ... + 10717.

It is an arithmetic number, because the mean of its divisors is an integer number (106990).

2⁴⁰⁶⁵⁴³ is an apocalyptic number.

406543 is a deficient number, since it is larger than the sum of its proper divisors (21417).

406543 is a wasteful number, since it uses less digits than its factorization.

406543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21416.

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 406543 is about 637.6072458810. The cubic root of 406543 is about 74.0802027923.

It can be divided in two parts, 406 and 543, that added together give a palindrome (949).

The spelling of 406543 in words is "four hundred six thousand, five hundred forty-three".