543809 has 4 divisors (see below), whose sum is σ = 621504. Its totient is φ = 466116.

The previous prime is 543797. The next prime is 543811. The reversal of 543809 is 908345.

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, and also an emirpimes, since its reverse is a distinct semiprime: 908345 = 5 ⋅181669.

It is not a de Polignac number, because 543809 - 2⁴ = 543793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (543859) 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, 38837 + ... + 38850.

It is an arithmetic number, because the mean of its divisors is an integer number (155376).

2⁵⁴³⁸⁰⁹ is an apocalyptic number.

It is an amenable number.

543809 is a deficient number, since it is larger than the sum of its proper divisors (77695).

543809 is an equidigital number, since it uses as much as digits as its factorization.

543809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77694.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 543809 is about 737.4340648492. The cubic root of 543809 is about 81.6235470459.

The spelling of 543809 in words is "five hundred forty-three thousand, eight hundred nine".