1998939583 has 2 divisors, whose sum is σ = 1998939584. Its totient is φ = 1998939582.

The previous prime is 1998939557. The next prime is 1998939589. The reversal of 1998939583 is 3859398991.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1998939583 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1998939589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 999469791 + 999469792.

It is an arithmetic number, because the mean of its divisors is an integer number (999469792).

Almost surely, 2^1998939583 is an apocalyptic number.

1998939583 is a deficient number, since it is larger than the sum of its proper divisors (1).

1998939583 is an equidigital number, since it uses as much as digits as its factorization.

1998939583 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18895680, while the sum is 64.

The square root of 1998939583 is about 44709.5021555821. The cubic root of 1998939583 is about 1259.6983369121.

The spelling of 1998939583 in words is "one billion, nine hundred ninety-eight million, nine hundred thirty-nine thousand, five hundred eighty-three".