1983993887 has 2 divisors, whose sum is σ = 1983993888. Its totient is φ = 1983993886.

The previous prime is 1983993871. The next prime is 1983993937. The reversal of 1983993887 is 7883993891.

It is a weak prime.

It is an emirp because it is prime and its reverse (7883993891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1983993887 - 2⁴ = 1983993871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1983993587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 991996943 + 991996944.

It is an arithmetic number, because the mean of its divisors is an integer number (991996944).

Almost surely, 2^1983993887 is an apocalyptic number.

1983993887 is a deficient number, since it is larger than the sum of its proper divisors (1).

1983993887 is an equidigital number, since it uses as much as digits as its factorization.

1983993887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23514624, while the sum is 65.

The square root of 1983993887 is about 44542.0462821366. The cubic root of 1983993887 is about 1256.5509704136.

The spelling of 1983993887 in words is "one billion, nine hundred eighty-three million, nine hundred ninety-three thousand, eight hundred eighty-seven".