1989210660 has 96 divisors (see below), whose sum is σ = 5827127040. Its totient is φ = 506068992.

The previous prime is 1989210631. The next prime is 1989210661. The reversal of 1989210660 is 660129891.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1989210661) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 595876 + ... + 599204.

It is an arithmetic number, because the mean of its divisors is an integer number (60699240).

Almost surely, 2^1989210660 is an apocalyptic number.

1989210660 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 1989210660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2913563520).

1989210660 is an abundant number, since it is smaller than the sum of its proper divisors (3837916380).

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

1989210660 is a wasteful number, since it uses less digits than its factorization.

1989210660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3797 (or 3795 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 42.

The square root of 1989210660 is about 44600.5679336037. The cubic root of 1989210660 is about 1257.6513441208.

The spelling of 1989210660 in words is "one billion, nine hundred eighty-nine million, two hundred ten thousand, six hundred sixty".