1989999983 has 2 divisors, whose sum is σ = 1989999984. Its totient is φ = 1989999982.

The previous prime is 1989999959. The next prime is 1990000003. The reversal of 1989999983 is 3899999891.

It is a strong prime.

It is an emirp because it is prime and its reverse (3899999891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1989999983 - 2⁶ = 1989999919 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1989999983.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1989999943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 994999991 + 994999992.

It is an arithmetic number, because the mean of its divisors is an integer number (994999992).

Almost surely, 2^1989999983 is an apocalyptic number.

1989999983 is a deficient number, since it is larger than the sum of its proper divisors (1).

1989999983 is an equidigital number, since it uses as much as digits as its factorization.

1989999983 is an evil number, because the sum of its binary digits is even.

The product of its digits is 102036672, while the sum is 74.

The square root of 1989999983 is about 44609.4158558482. The cubic root of 1989999983 is about 1257.8176683618.

The spelling of 1989999983 in words is "one billion, nine hundred eighty-nine million, nine hundred ninety-nine thousand, nine hundred eighty-three".