1988021040784 has 15 divisors (see below), whose sum is σ = 3851801693833. Its totient is φ = 994007700448.

The previous prime is 1988021040769. The next prime is 1988021040833. The reversal of 1988021040784 is 4870401208891.

The square root of 1988021040784 is 1409972.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 367308723600 + 1620712317184 = 606060^2 + 1273072^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 5463642 + ... + 5816134.

Almost surely, 2^{1988021040784} is an apocalyptic number.

1988021040784 is the 1409972-nd square number.

It is an amenable number.

1988021040784 is a deficient number, since it is larger than the sum of its proper divisors (1863780653049).

1988021040784 is an frugal number, since it uses more digits than its factorization.

1988021040784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 704994 (or 352495 counting only the distinct ones).

The product of its (nonzero) digits is 1032192, while the sum is 52.

The spelling of 1988021040784 in words is "one trillion, nine hundred eighty-eight billion, twenty-one million, forty thousand, seven hundred eighty-four".