1198489728 has 128 divisors (see below), whose sum is σ = 3313612800. Its totient is φ = 383344640.

The previous prime is 1198489711. The next prime is 1198489739. The reversal of 1198489728 is 8279848911.

It is a tau number, because it is divible by the number of its divisors (128).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3129025 + ... + 3129407.

It is an arithmetic number, because the mean of its divisors is an integer number (25887600).

Almost surely, 2^1198489728 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 1198489728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1656806400).

1198489728 is an abundant number, since it is smaller than the sum of its proper divisors (2115123072).

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

1198489728 is a wasteful number, since it uses less digits than its factorization.

1198489728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 710 (or 698 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 57.

The square root of 1198489728 is about 34619.2103896088. The cubic root of 1198489728 is about 1062.2125755040.

The spelling of 1198489728 in words is "one billion, one hundred ninety-eight million, four hundred eighty-nine thousand, seven hundred twenty-eight".