563866 has 4 divisors (see below), whose sum is σ = 845802. Its totient is φ = 281932.

The previous prime is 563851. The next prime is 563869. The reversal of 563866 is 668365.

563866 is an esthetic number in base 16, because in such base its adjacent digits differ by 1.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 668365 = 5 ⋅133673.

It can be written as a sum of positive squares in only one way, i.e., 455625 + 108241 = 675^2 + 329^2 .

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (563869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140965 + ... + 140968.

2⁵⁶³⁸⁶⁶ is an apocalyptic number.

563866 is a deficient number, since it is larger than the sum of its proper divisors (281936).

563866 is a wasteful number, since it uses less digits than its factorization.

563866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281935.

The product of its digits is 25920, while the sum is 34.

The square root of 563866 is about 750.9101144611. The cubic root of 563866 is about 82.6149484287.

The spelling of 563866 in words is "five hundred sixty-three thousand, eight hundred sixty-six".