1988521920 has 896 divisors, whose sum is σ = 9070848000. Its totient is φ = 406425600.

The previous prime is 1988521903. The next prime is 1988521961. The reversal of 1988521920 is 291258891.

1988521920 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 32598690 + ... + 32598750.

Almost surely, 2^1988521920 is an apocalyptic number.

1988521920 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 1988521920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4535424000).

1988521920 is an abundant number, since it is smaller than the sum of its proper divisors (7082326080).

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

1988521920 is a wasteful number, since it uses less digits than its factorization.

1988521920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119 (or 89 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 45.

The square root of 1988521920 is about 44592.8460630178. The cubic root of 1988521920 is about 1257.5061785377.

The spelling of 1988521920 in words is "one billion, nine hundred eighty-eight million, five hundred twenty-one thousand, nine hundred twenty".