543409 has 4 divisors (see below), whose sum is σ = 553716. Its totient is φ = 533104.

The previous prime is 543407. The next prime is 543427. The reversal of 543409 is 904345.

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

It can be written as a sum of positive squares in 2 ways, for example, as 216225 + 327184 = 465^2 + 572^2 .

It is a cyclic number.

It is not a de Polignac number, because 543409 - 2¹ = 543407 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (543407) 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, 5074 + ... + 5179.

It is an arithmetic number, because the mean of its divisors is an integer number (138429).

2⁵⁴³⁴⁰⁹ is an apocalyptic number.

It is an amenable number.

543409 is a deficient number, since it is larger than the sum of its proper divisors (10307).

543409 is a wasteful number, since it uses less digits than its factorization.

543409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10306.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 543409 is about 737.1628042705. The cubic root of 543409 is about 81.6035293392.

The spelling of 543409 in words is "five hundred forty-three thousand, four hundred nine".