1989036720 has 540 divisors, whose sum is σ = 7898348640. Its totient is φ = 448081920.

The previous prime is 1989036697. The next prime is 1989036727. The reversal of 1989036720 is 276309891.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1989036727) by changing a digit.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 25177641 + ... + 25177719.

Almost surely, 2^1989036720 is an apocalyptic number.

1989036720 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 1989036720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3949174320).

1989036720 is an abundant number, since it is smaller than the sum of its proper divisors (5909311920).

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

1989036720 is a wasteful number, since it uses less digits than its factorization.

1989036720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154 (or 117 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 45.

The square root of 1989036720 is about 44598.6179158054. The cubic root of 1989036720 is about 1257.6146859870.

The spelling of 1989036720 in words is "one billion, nine hundred eighty-nine million, thirty-six thousand, seven hundred twenty".