989550 has 48 divisors (see below), whose sum is σ = 2730480. Its totient is φ = 263520.

The previous prime is 989533. The next prime is 989557. The reversal of 989550 is 55989.

It is a Curzon number.

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 989550.

It is not an unprimeable number, because it can be changed into a prime (989557) 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, 984 + ... + 1716.

It is an arithmetic number, because the mean of its divisors is an integer number (56885).

2⁹⁸⁹⁵⁵⁰ is an apocalyptic number.

989550 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 989550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1365240).

989550 is an abundant number, since it is smaller than the sum of its proper divisors (1740930).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

989550 is a wasteful number, since it uses less digits than its factorization.

989550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 754 (or 743 counting only the distinct ones).

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

The square root of 989550 is about 994.7612778954. The cubic root of 989550 is about 99.6504462119.

The spelling of 989550 in words is "nine hundred eighty-nine thousand, five hundred fifty".