1998995837 has 2 divisors, whose sum is σ = 1998995838. Its totient is φ = 1998995836.

The previous prime is 1998995777. The next prime is 1998995863. The reversal of 1998995837 is 7385998991.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1747741636 + 251254201 = 41806^2 + 15851^2 .

It is a cyclic number.

It is not a de Polignac number, because 1998995837 - 2¹⁰ = 1998994813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1998992837) 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, 999497918 + 999497919.

It is an arithmetic number, because the mean of its divisors is an integer number (999497919).

Almost surely, 2^1998995837 is an apocalyptic number.

It is an amenable number.

1998995837 is a deficient number, since it is larger than the sum of its proper divisors (1).

1998995837 is an equidigital number, since it uses as much as digits as its factorization.

1998995837 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 44089920, while the sum is 68.

The square root of 1998995837 is about 44710.1312567968. The cubic root of 1998995837 is about 1259.7101535784.

The spelling of 1998995837 in words is "one billion, nine hundred ninety-eight million, nine hundred ninety-five thousand, eight hundred thirty-seven".