556686 has 48 divisors (see below), whose sum is σ = 1361520. Its totient is φ = 168480.

The previous prime is 556679. The next prime is 556687. The reversal of 556686 is 686655.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 556686.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (556687) 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 23 ways as a sum of consecutive naturals, for example, 9096 + ... + 9156.

It is an arithmetic number, because the mean of its divisors is an integer number (28365).

2⁵⁵⁶⁶⁸⁶ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 556686, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (680760).

556686 is an abundant number, since it is smaller than the sum of its proper divisors (804834).

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

556686 is a wasteful number, since it uses less digits than its factorization.

556686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98 (or 79 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 556686 is about 746.1139323187. The cubic root of 556686 is about 82.2627896828.

The spelling of 556686 in words is "five hundred fifty-six thousand, six hundred eighty-six".