989641440 has 144 divisors (see below), whose sum is σ = 3441136608. Its totient is φ = 258905088.

The previous prime is 989641439. The next prime is 989641441. The reversal of 989641440 is 44146989.

It is an interprime number because it is at equal distance from previous prime (989641439) and next prime (989641441).

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989641441) 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, 69837 + ... + 82803.

It is an arithmetic number, because the mean of its divisors is an integer number (23896782).

Almost surely, 2^989641440 is an apocalyptic number.

989641440 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 989641440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1720568304).

989641440 is an abundant number, since it is smaller than the sum of its proper divisors (2451495168).

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

989641440 is a wasteful number, since it uses less digits than its factorization.

989641440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13041 (or 13030 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The square root of 989641440 is about 31458.5670366595. The cubic root of 989641440 is about 996.5351553838.

The spelling of 989641440 in words is "nine hundred eighty-nine million, six hundred forty-one thousand, four hundred forty".