1489321728 has 216 divisors, whose sum is σ = 4519897200. Its totient is φ = 489037824.

The previous prime is 1489321723. The next prime is 1489321733. The reversal of 1489321728 is 8271239841.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1489321723) and next prime (1489321733).

It is a tau number, because it is divible by the number of its divisors (216).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1489321721) 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 23 ways as a sum of consecutive naturals, for example, 5536378 + ... + 5536646.

It is an arithmetic number, because the mean of its divisors is an integer number (20925450).

Almost surely, 2^1489321728 is an apocalyptic number.

1489321728 is a gapful number since it is divisible by the number (18) 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 1489321728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2259948600).

1489321728 is an abundant number, since it is smaller than the sum of its proper divisors (3030575472).

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

1489321728 is an frugal number, since it uses more digits than its factorization.

1489321728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 389 (or 363 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 1489321728 is about 38591.7313423485. The cubic root of 1489321728 is about 1141.9914222823.

The spelling of 1489321728 in words is "one billion, four hundred eighty-nine million, three hundred twenty-one thousand, seven hundred twenty-eight".