989440 has 36 divisors (see below), whose sum is σ = 2373084. Its totient is φ = 395264.

The previous prime is 989423. The next prime is 989441. The reversal of 989440 is 44989.

It can be written as a sum of positive squares in 2 ways, for example, as 186624 + 802816 = 432^2 + 896^2 .

It is a junction number, because it is equal to n+sod(n) for n = 989396 and 989405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989441) by changing a digit.

989440 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 894 + ... + 1666.

It is an arithmetic number, because the mean of its divisors is an integer number (65919).

2⁹⁸⁹⁴⁴⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 989440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1186542).

989440 is an abundant number, since it is smaller than the sum of its proper divisors (1383644).

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

989440 is an equidigital number, since it uses as much as digits as its factorization.

989440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 794 (or 780 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 989440 is about 994.7059867117. The cubic root of 989440 is about 99.6467536394.

The spelling of 989440 in words is "nine hundred eighty-nine thousand, four hundred forty".