1989041201840 has 480 divisors, whose sum is σ = 6079302149760. Its totient is φ = 591784427520.

The previous prime is 1989041201827. The next prime is 1989041201843. The reversal of 1989041201840 is 481021409891.

It is a happy number.

It is a super-2 number, since 2×1989041201840² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1989041201843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 132869876 + ... + 132884844.

It is an arithmetic number, because the mean of its divisors is an integer number (12665212812).

Almost surely, 2^{1989041201840} is an apocalyptic number.

1989041201840 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 1989041201840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3039651074880).

1989041201840 is an abundant number, since it is smaller than the sum of its proper divisors (4090260947920).

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

1989041201840 is a wasteful number, since it uses less digits than its factorization.

1989041201840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15101 (or 15084 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 47.

The spelling of 1989041201840 in words is "one trillion, nine hundred eighty-nine billion, forty-one million, two hundred one thousand, eight hundred forty".