558440 has 32 divisors (see below), whose sum is σ = 1313280. Its totient is φ = 213312.

The previous prime is 558431. The next prime is 558457. The reversal of 558440 is 44855.

It is an unprimeable number.

558440 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 7 ways as a sum of consecutive naturals, for example, 617 + ... + 1223.

It is an arithmetic number, because the mean of its divisors is an integer number (41040).

2⁵⁵⁸⁴⁴⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 558440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (656640).

558440 is an abundant number, since it is smaller than the sum of its proper divisors (754840).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

558440 is a wasteful number, since it uses less digits than its factorization.

558440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 641 (or 637 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 26.

The square root of 558440 is about 747.2884315979. The cubic root of 558440 is about 82.3490966593.

The spelling of 558440 in words is "five hundred fifty-eight thousand, four hundred forty".