1998345073 has 2 divisors, whose sum is σ = 1998345074. Its totient is φ = 1998345072.

The previous prime is 1998345047. The next prime is 1998345077. The reversal of 1998345073 is 3705438991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1988535649 + 9809424 = 44593^2 + 3132^2 .

It is an emirp because it is prime and its reverse (3705438991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1998345073 - 2⁹ = 1998344561 is a prime.

It is not a weakly prime, because it can be changed into another prime (1998345077) 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, 999172536 + 999172537.

It is an arithmetic number, because the mean of its divisors is an integer number (999172537).

Almost surely, 2^1998345073 is an apocalyptic number.

It is an amenable number.

1998345073 is a deficient number, since it is larger than the sum of its proper divisors (1).

1998345073 is an equidigital number, since it uses as much as digits as its factorization.

1998345073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 816480, while the sum is 49.

The square root of 1998345073 is about 44702.8530744963. The cubic root of 1998345073 is about 1259.5734411055.

It can be divided in two parts, 19983 and 45073, that added together give a palindrome (65056).

The spelling of 1998345073 in words is "one billion, nine hundred ninety-eight million, three hundred forty-five thousand, seventy-three".