1985887918980 has 288 divisors, whose sum is σ = 7045458900480. Its totient is φ = 443416135680.

The previous prime is 1985887918969. The next prime is 1985887919017. The reversal of 1985887918980 is 898197885891.

1985887918980 is a `hidden beast` number, since 19 + 8 + 588 + 7 + 9 + 18 + 9 + 8 + 0 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 1985887918980.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 9649312 + ... + 9852968.

It is an arithmetic number, because the mean of its divisors is an integer number (24463398960).

Almost surely, 2^{1985887918980} is an apocalyptic number.

1985887918980 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 1985887918980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3522729450240).

1985887918980 is an abundant number, since it is smaller than the sum of its proper divisors (5059570981500).

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

1985887918980 is a wasteful number, since it uses less digits than its factorization.

1985887918980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203859 (or 203854 counting only the distinct ones).

The product of its (nonzero) digits is 836075520, while the sum is 81.

The spelling of 1985887918980 in words is "one trillion, nine hundred eighty-five billion, eight hundred eighty-seven million, nine hundred eighteen thousand, nine hundred eighty".