543909 has 4 divisors (see below), whose sum is σ = 725216. Its totient is φ = 362604.

The previous prime is 543901. The next prime is 543911. The reversal of 543909 is 909345.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 543909 - 2³ = 543901 is a prime.

It is an Ulam number.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (543901) 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, 90649 + ... + 90654.

It is an arithmetic number, because the mean of its divisors is an integer number (181304).

2⁵⁴³⁹⁰⁹ is an apocalyptic number.

It is an amenable number.

543909 is a deficient number, since it is larger than the sum of its proper divisors (181307).

543909 is a wasteful number, since it uses less digits than its factorization.

543909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181306.

The product of its (nonzero) digits is 4860, while the sum is 30.

The square root of 543909 is about 737.5018644044. The cubic root of 543909 is about 81.6285499388.

The spelling of 543909 in words is "five hundred forty-three thousand, nine hundred nine".