1998004597 has 2 divisors, whose sum is σ = 1998004598. Its totient is φ = 1998004596.

The previous prime is 1998004537. The next prime is 1998004643. The reversal of 1998004597 is 7954008991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1905671716 + 92332881 = 43654^2 + 9609^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1998004597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1998004537) 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, 999002298 + 999002299.

It is an arithmetic number, because the mean of its divisors is an integer number (999002299).

Almost surely, 2^1998004597 is an apocalyptic number.

It is an amenable number.

1998004597 is a deficient number, since it is larger than the sum of its proper divisors (1).

1998004597 is an equidigital number, since it uses as much as digits as its factorization.

1998004597 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 52.

The square root of 1998004597 is about 44699.0446989642. The cubic root of 1998004597 is about 1259.5019020954.

The spelling of 1998004597 in words is "one billion, nine hundred ninety-eight million, four thousand, five hundred ninety-seven".