842563 has 4 divisors (see below), whose sum is σ = 852120. Its totient is φ = 833008.

The previous prime is 842551. The next prime is 842581. The reversal of 842563 is 365248.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 842563 - 2⁵ = 842531 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13 and base 15.

It is not an unprimeable number, because it can be changed into a prime (842063) 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 3 ways as a sum of consecutive naturals, for example, 4645 + ... + 4822.

It is an arithmetic number, because the mean of its divisors is an integer number (213030).

2⁸⁴²⁵⁶³ is an apocalyptic number.

842563 is a deficient number, since it is larger than the sum of its proper divisors (9557).

842563 is an equidigital number, since it uses as much as digits as its factorization.

842563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9556.

The product of its digits is 5760, while the sum is 28.

The square root of 842563 is about 917.9123051795. The cubic root of 842563 is about 94.4497460564.

The spelling of 842563 in words is "eight hundred forty-two thousand, five hundred sixty-three".