1988987983 has 2 divisors, whose sum is σ = 1988987984. Its totient is φ = 1988987982.

The previous prime is 1988987953. The next prime is 1988988041. The reversal of 1988987983 is 3897898891.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1988987983 - 2¹³ = 1988979791 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1988987953) 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 as a sum of consecutive naturals, namely, 994493991 + 994493992.

It is an arithmetic number, because the mean of its divisors is an integer number (994493992).

Almost surely, 2^1988987983 is an apocalyptic number.

1988987983 is a deficient number, since it is larger than the sum of its proper divisors (1).

1988987983 is an equidigital number, since it uses as much as digits as its factorization.

1988987983 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 62705664, while the sum is 70.

The square root of 1988987983 is about 44598.0715166026. The cubic root of 1988987983 is about 1257.6044142029.

The spelling of 1988987983 in words is "one billion, nine hundred eighty-eight million, nine hundred eighty-seven thousand, nine hundred eighty-three".