1989537880 has 128 divisors (see below), whose sum is σ = 5443200000. Its totient is φ = 645027840.

The previous prime is 1989537859. The next prime is 1989537911. The reversal of 1989537880 is 887359891.

1989537880 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (58) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 135121 + ... + 149119.

It is an arithmetic number, because the mean of its divisors is an integer number (42525000).

Almost surely, 2^1989537880 is an apocalyptic number.

1989537880 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 1989537880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2721600000).

1989537880 is an abundant number, since it is smaller than the sum of its proper divisors (3453662120).

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

1989537880 is a wasteful number, since it uses less digits than its factorization.

1989537880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14057 (or 14053 counting only the distinct ones).

The product of its (nonzero) digits is 4354560, while the sum is 58.

The square root of 1989537880 is about 44604.2361216959. The cubic root of 1989537880 is about 1257.7203004691.

It can be divided in two parts, 19895 and 37880, that added together give a palindrome (57775).

The spelling of 1989537880 in words is "one billion, nine hundred eighty-nine million, five hundred thirty-seven thousand, eight hundred eighty".