1998956885 has 8 divisors (see below), whose sum is σ = 2438072376. Its totient is φ = 1572949440.

The previous prime is 1998956837. The next prime is 1998956893. The reversal of 1998956885 is 5886598991.

It can be written as a sum of positive squares in 4 ways, for example, as 279859441 + 1719097444 = 16729^2 + 41462^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1998956885 - 2¹⁴ = 1998940501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 3276674 + ... + 3277283.

It is an arithmetic number, because the mean of its divisors is an integer number (304759047).

Almost surely, 2^1998956885 is an apocalyptic number.

It is an amenable number.

1998956885 is a deficient number, since it is larger than the sum of its proper divisors (439115491).

1998956885 is an equidigital number, since it uses as much as digits as its factorization.

1998956885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6554023.

The product of its digits is 55987200, while the sum is 68.

The square root of 1998956885 is about 44709.6956487069. The cubic root of 1998956885 is about 1259.7019713788.

The spelling of 1998956885 in words is "one billion, nine hundred ninety-eight million, nine hundred fifty-six thousand, eight hundred eighty-five".