1989306000 has 640 divisors, whose sum is σ = 8273041920. Its totient is φ = 451584000.

The previous prime is 1989305987. The next prime is 1989306001. The reversal of 1989306000 is 6039891.

1989306000 is a `hidden beast` number, since 19 + 8 + 9 + 30 + 600 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1989306001) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 10097902 + ... + 10098098.

It is an arithmetic number, because the mean of its divisors is an integer number (12926628).

Almost surely, 2^1989306000 is an apocalyptic number.

1989306000 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 1989306000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4136520960).

1989306000 is an abundant number, since it is smaller than the sum of its proper divisors (6283735920).

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

1989306000 is a wasteful number, since it uses less digits than its factorization.

1989306000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257 (or 235 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 1989306000 is about 44601.6367412677. The cubic root of 1989306000 is about 1257.6714362719.

The spelling of 1989306000 in words is "one billion, nine hundred eighty-nine million, three hundred six thousand".