556789 has 2 divisors, whose sum is σ = 556790. Its totient is φ = 556788.

The previous prime is 556781. The next prime is 556793. The reversal of 556789 is 987655.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 555025 + 1764 = 745^2 + 42^2 .

It is a cyclic number.

It is not a de Polignac number, because 556789 - 2³ = 556781 is a prime.

It is a plaindrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (556781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 278394 + 278395.

It is an arithmetic number, because the mean of its divisors is an integer number (278395).

2⁵⁵⁶⁷⁸⁹ is an apocalyptic number.

It is an amenable number.

556789 is a deficient number, since it is larger than the sum of its proper divisors (1).

556789 is an equidigital number, since it uses as much as digits as its factorization.

556789 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 75600, while the sum is 40.

The square root of 556789 is about 746.1829534370. The cubic root of 556789 is about 82.2678628867.

The spelling of 556789 in words is "five hundred fifty-six thousand, seven hundred eighty-nine".