1989136896 has 80 divisors (see below), whose sum is σ = 5312529024. Its totient is φ = 661377024.

The previous prime is 1989136817. The next prime is 1989136907. The reversal of 1989136896 is 6986319891.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 709770 + ... + 712566.

Almost surely, 2^1989136896 is an apocalyptic number.

1989136896 is a gapful number since it is divisible by the number (16) 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 1989136896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2656264512).

1989136896 is an abundant number, since it is smaller than the sum of its proper divisors (3323392128).

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

1989136896 is an equidigital number, since it uses as much as digits as its factorization.

1989136896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3281 (or 3265 counting only the distinct ones).

The product of its digits is 5038848, while the sum is 60.

The square root of 1989136896 is about 44599.7409857950. The cubic root of 1989136896 is about 1257.6357985005.

The spelling of 1989136896 in words is "one billion, nine hundred eighty-nine million, one hundred thirty-six thousand, eight hundred ninety-six".