557866 has 8 divisors (see below), whose sum is σ = 848484. Its totient is φ = 275040.

The previous prime is 557863. The next prime is 557891. The reversal of 557866 is 668755.

It can be written as a sum of positive squares in 2 ways, for example, as 519841 + 38025 = 721^2 + 195^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×557866² = 622428947912, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (557861) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1765 + ... + 2056.

2⁵⁵⁷⁸⁶⁶ is an apocalyptic number.

557866 is a deficient number, since it is larger than the sum of its proper divisors (290618).

557866 is a wasteful number, since it uses less digits than its factorization.

557866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3896.

The product of its digits is 50400, while the sum is 37.

The square root of 557866 is about 746.9042776688. The cubic root of 557866 is about 82.3208724478.

Subtracting 557866 from its reverse (668755), we obtain a square (110889 = 333²).

It can be divided in two parts, 55 and 7866, that added together give a square (7921 = 89²).

The spelling of 557866 in words is "five hundred fifty-seven thousand, eight hundred sixty-six".