1989823680 has 168 divisors, whose sum is σ = 7370777232. Its totient is φ = 489793536.

The previous prime is 1989823673. The next prime is 1989823699. The reversal of 1989823680 is 863289891.

It is a happy number.

1989823680 is a `hidden beast` number, since 198 + 98 + 2 + 368 + 0 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10867 + ... + 64013.

It is an arithmetic number, because the mean of its divisors is an integer number (43873674).

Almost surely, 2^1989823680 is an apocalyptic number.

1989823680 is a gapful number since it is divisible by the number (10) 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 1989823680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3685388616).

1989823680 is an abundant number, since it is smaller than the sum of its proper divisors (5380953552).

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

1989823680 is a wasteful number, since it uses less digits than its factorization.

1989823680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53183 (or 53170 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 54.

The square root of 1989823680 is about 44607.4397382320. The cubic root of 1989823680 is about 1257.7805220336.

The spelling of 1989823680 in words is "one billion, nine hundred eighty-nine million, eight hundred twenty-three thousand, six hundred eighty".