1988421120 has 240 divisors, whose sum is σ = 7870880160. Its totient is φ = 454459392.

The previous prime is 1988421119. The next prime is 1988421131. The reversal of 1988421120 is 211248891.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 155116 + ... + 167444.

It is an arithmetic number, because the mean of its divisors is an integer number (32795334).

Almost surely, 2^1988421120 is an apocalyptic number.

1988421120 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 1988421120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3935440080).

1988421120 is an abundant number, since it is smaller than the sum of its proper divisors (5882459040).

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

1988421120 is a wasteful number, since it uses less digits than its factorization.

1988421120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12365 (or 12346 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 36.

The square root of 1988421120 is about 44591.7158225606. The cubic root of 1988421120 is about 1257.4849301315.

The spelling of 1988421120 in words is "one billion, nine hundred eighty-eight million, four hundred twenty-one thousand, one hundred twenty".