1986386472320 has 128 divisors (see below), whose sum is σ = 4879318862880. Its totient is φ = 772853760000.

The previous prime is 1986386472271. The next prime is 1986386472391. The reversal of 1986386472320 is 232746836891.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Smith number, since the sum of its digits (59) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 1986386472320.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6482570 + ... + 6782070.

Almost surely, 2^{1986386472320} is an apocalyptic number.

1986386472320 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 1986386472320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2439659431440).

1986386472320 is an abundant number, since it is smaller than the sum of its proper divisors (2892932390560).

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

1986386472320 is a wasteful number, since it uses less digits than its factorization.

1986386472320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299804 (or 299792 counting only the distinct ones).

The product of its (nonzero) digits is 20901888, while the sum is 59.

The spelling of 1986386472320 in words is "one trillion, nine hundred eighty-six billion, three hundred eighty-six million, four hundred seventy-two thousand, three hundred twenty".