563986 has 4 divisors (see below), whose sum is σ = 845982. Its totient is φ = 281992.

The previous prime is 563971. The next prime is 563987. The reversal of 563986 is 689365.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 689365 = 5 ⋅137873.

It can be written as a sum of positive squares in only one way, i.e., 378225 + 185761 = 615^2 + 431^2 .

It is not an unprimeable number, because it can be changed into a prime (563987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140995 + ... + 140998.

2⁵⁶³⁹⁸⁶ is an apocalyptic number.

563986 is a deficient number, since it is larger than the sum of its proper divisors (281996).

563986 is a wasteful number, since it uses less digits than its factorization.

563986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281995.

The product of its digits is 38880, while the sum is 37.

The square root of 563986 is about 750.9900132492. The cubic root of 563986 is about 82.6208086216.

The spelling of 563986 in words is "five hundred sixty-three thousand, nine hundred eighty-six".