1987980041 has 4 divisors (see below), whose sum is σ = 2006218500. Its totient is φ = 1969741584.

The previous prime is 1987980037. The next prime is 1987980077. The reversal of 1987980041 is 1400897891.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 496398400 + 1491581641 = 22280^2 + 38621^2 .

It is a cyclic number.

It is not a de Polignac number, because 1987980041 - 2² = 1987980037 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1987980941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9119066 + ... + 9119283.

It is an arithmetic number, because the mean of its divisors is an integer number (501554625).

Almost surely, 2^1987980041 is an apocalyptic number.

It is an amenable number.

1987980041 is a deficient number, since it is larger than the sum of its proper divisors (18238459).

1987980041 is a wasteful number, since it uses less digits than its factorization.

1987980041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18238458.

The product of its (nonzero) digits is 145152, while the sum is 47.

The square root of 1987980041 is about 44586.7697977775. The cubic root of 1987980041 is about 1257.3919432542.

The spelling of 1987980041 in words is "one billion, nine hundred eighty-seven million, nine hundred eighty thousand, forty-one".