1987265949872 has 40 divisors (see below), whose sum is σ = 4400824281600. Its totient is φ = 851598372672.

The previous prime is 1987265949871. The next prime is 1987265949887. The reversal of 1987265949872 is 2789495627891.

It is a junction number, because it is equal to n+sod(n) for n = 1987265949793 and 1987265949802.

It is not an unprimeable number, because it can be changed into a prime (1987265949871) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 200279 + ... + 2003657.

It is an arithmetic number, because the mean of its divisors is an integer number (110020607040).

Almost surely, 2^{1987265949872} is an apocalyptic number.

It is an amenable number.

1987265949872 is an abundant number, since it is smaller than the sum of its proper divisors (2413558331728).

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

1987265949872 is a wasteful number, since it uses less digits than its factorization.

1987265949872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1813233 (or 1813227 counting only the distinct ones).

The product of its digits is 1097349120, while the sum is 77.

The spelling of 1987265949872 in words is "one trillion, nine hundred eighty-seven billion, two hundred sixty-five million, nine hundred forty-nine thousand, eight hundred seventy-two".