1989208704 has 192 divisors, whose sum is σ = 6237259200. Its totient is φ = 559964160.

The previous prime is 1989208699. The next prime is 1989208717. The reversal of 1989208704 is 4078029891.

It is a tau number, because it is divible by the number of its divisors (192).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

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, 1335192 + ... + 1336680.

It is an arithmetic number, because the mean of its divisors is an integer number (32485725).

Almost surely, 2^1989208704 is an apocalyptic number.

1989208704 is a gapful number since it is divisible by the number (14) 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 1989208704, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3118629600).

1989208704 is an abundant number, since it is smaller than the sum of its proper divisors (4248050496).

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

1989208704 is a wasteful number, since it uses less digits than its factorization.

1989208704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1591 (or 1572 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 48.

The square root of 1989208704 is about 44600.5460056264. The cubic root of 1989208704 is about 1257.6509319025.

The spelling of 1989208704 in words is "one billion, nine hundred eighty-nine million, two hundred eight thousand, seven hundred four".