1989637632 has 120 divisors (see below), whose sum is σ = 5992210224. Its totient is φ = 634343424.

The previous prime is 1989637603. The next prime is 1989637633. The reversal of 1989637632 is 2367369891.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1989637633) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 96598 + ... + 115370.

Almost surely, 2^1989637632 is an apocalyptic number.

1989637632 is a gapful number since it is divisible by the number (12) 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 1989637632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2996105112).

1989637632 is an abundant number, since it is smaller than the sum of its proper divisors (4002572592).

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

1989637632 is a wasteful number, since it uses less digits than its factorization.

1989637632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18820 (or 18801 counting only the distinct ones).

The product of its digits is 2939328, while the sum is 54.

The square root of 1989637632 is about 44605.3542974383. The cubic root of 1989637632 is about 1257.7413200938.

The spelling of 1989637632 in words is "one billion, nine hundred eighty-nine million, six hundred thirty-seven thousand, six hundred thirty-two".