1983993871 has 2 divisors, whose sum is σ = 1983993872. Its totient is φ = 1983993870.

The previous prime is 1983993863. The next prime is 1983993887. The reversal of 1983993871 is 1783993891.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1983993871 - 2³ = 1983993863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1983993071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 991996935 + 991996936.

It is an arithmetic number, because the mean of its divisors is an integer number (991996936).

Almost surely, 2^1983993871 is an apocalyptic number.

1983993871 is a deficient number, since it is larger than the sum of its proper divisors (1).

1983993871 is an equidigital number, since it uses as much as digits as its factorization.

1983993871 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2939328, while the sum is 58.

The square root of 1983993871 is about 44542.0461025310. The cubic root of 1983993871 is about 1256.5509670357.

The spelling of 1983993871 in words is "one billion, nine hundred eighty-three million, nine hundred ninety-three thousand, eight hundred seventy-one".