556985 has 32 divisors (see below), whose sum is σ = 846720. Its totient is φ = 345600.

The previous prime is 556981. The next prime is 556987. The reversal of 556985 is 589655.

556985 = 220² + 221² + ... + 230².

It is not a de Polignac number, because 556985 - 2² = 556981 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (556981) 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 in 31 ways as a sum of consecutive naturals, for example, 13565 + ... + 13605.

It is an arithmetic number, because the mean of its divisors is an integer number (26460).

2⁵⁵⁶⁹⁸⁵ is an apocalyptic number.

556985 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

556985 is a deficient number, since it is larger than the sum of its proper divisors (289735).

556985 is a wasteful number, since it uses less digits than its factorization.

556985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89.

The product of its digits is 54000, while the sum is 38.

The square root of 556985 is about 746.3142769638. The cubic root of 556985 is about 82.2775150227.

The spelling of 556985 in words is "five hundred fifty-six thousand, nine hundred eighty-five".