989563 has 4 divisors (see below), whose sum is σ = 1008288. Its totient is φ = 970840.

The previous prime is 989561. The next prime is 989579. The reversal of 989563 is 365989.

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 989563 - 2¹ = 989561 is a prime.

It is a Duffinian number.

989563 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (989561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9283 + ... + 9388.

It is an arithmetic number, because the mean of its divisors is an integer number (252072).

2⁹⁸⁹⁵⁶³ is an apocalyptic number.

989563 is a deficient number, since it is larger than the sum of its proper divisors (18725).

989563 is a wasteful number, since it uses less digits than its factorization.

989563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18724.

The product of its digits is 58320, while the sum is 40.

The square root of 989563 is about 994.7678121049. The cubic root of 989563 is about 99.6508825887.

The spelling of 989563 in words is "nine hundred eighty-nine thousand, five hundred sixty-three".