989505 has 24 divisors (see below), whose sum is σ = 1872000. Its totient is φ = 479520.

The previous prime is 989479. The next prime is 989507. The reversal of 989505 is 505989.

It is not a de Polignac number, because 989505 - 2⁶ = 989441 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 989505.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 989505.

It is not an unprimeable number, because it can be changed into a prime (989507) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 505 + ... + 1494.

It is an arithmetic number, because the mean of its divisors is an integer number (78000).

2⁹⁸⁹⁵⁰⁵ is an apocalyptic number.

It is an amenable number.

989505 is a deficient number, since it is larger than the sum of its proper divisors (882495).

989505 is a wasteful number, since it uses less digits than its factorization.

989505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2021 (or 2018 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 36.

The square root of 989505 is about 994.7386591462. The cubic root of 989505 is about 99.6489356471.

The spelling of 989505 in words is "nine hundred eighty-nine thousand, five hundred five".