556389 has 10 divisors (see below), whose sum is σ = 831270. Its totient is φ = 370872.

The previous prime is 556373. The next prime is 556399. The reversal of 556389 is 983655.

It can be written as a sum of positive squares in only one way, i.e., 311364 + 245025 = 558^2 + 495^2 .

It is not a de Polignac number, because 556389 - 2⁴ = 556373 is a prime.

It is a Curzon number.

556389 is a lucky number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 556389.

It is not an unprimeable number, because it can be changed into a prime (556399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 3354 + ... + 3515.

It is an arithmetic number, because the mean of its divisors is an integer number (83127).

2⁵⁵⁶³⁸⁹ is an apocalyptic number.

It is an amenable number.

556389 is a deficient number, since it is larger than the sum of its proper divisors (274881).

556389 is an equidigital number, since it uses as much as digits as its factorization.

556389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6881 (or 6872 counting only the distinct ones).

The product of its digits is 32400, while the sum is 36.

The square root of 556389 is about 745.9148744998. The cubic root of 556389 is about 82.2481576193.

The spelling of 556389 in words is "five hundred fifty-six thousand, three hundred eighty-nine".