1986891853720 has 192 divisors, whose sum is σ = 4692780761760. Its totient is φ = 756651571200.

The previous prime is 1986891853711. The next prime is 1986891853741. The reversal of 1986891853720 is 273581986891.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1778774602 + ... + 1778775718.

Almost surely, 2^{1986891853720} is an apocalyptic number.

1986891853720 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 1986891853720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2346390380880).

1986891853720 is an abundant number, since it is smaller than the sum of its proper divisors (2705888908040).

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

1986891853720 is a wasteful number, since it uses less digits than its factorization.

1986891853720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1754 (or 1703 counting only the distinct ones).

The product of its (nonzero) digits is 52254720, while the sum is 67.

The spelling of 1986891853720 in words is "one trillion, nine hundred eighty-six billion, eight hundred ninety-one million, eight hundred fifty-three thousand, seven hundred twenty".