558409 has 4 divisors (see below), whose sum is σ = 560404. Its totient is φ = 556416.

The previous prime is 558401. The next prime is 558413. The reversal of 558409 is 904855.

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 164025 + 394384 = 405^2 + 628^2 .

It is a cyclic number.

It is not a de Polignac number, because 558409 - 2³ = 558401 is a prime.

It is a super-2 number, since 2×558409² = 623641222562, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (558401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 492 + ... + 1165.

It is an arithmetic number, because the mean of its divisors is an integer number (140101).

2⁵⁵⁸⁴⁰⁹ is an apocalyptic number.

It is an amenable number.

558409 is a deficient number, since it is larger than the sum of its proper divisors (1995).

558409 is a wasteful number, since it uses less digits than its factorization.

558409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1994.

The product of its (nonzero) digits is 7200, while the sum is 31.

The square root of 558409 is about 747.2676896534. The cubic root of 558409 is about 82.3475728493.

It can be divided in two parts, 55 and 8409, that added together give a square (8464 = 92²).

The spelling of 558409 in words is "five hundred fifty-eight thousand, four hundred nine".