1999559985 has 32 divisors (see below), whose sum is σ = 3379335168. Its totient is φ = 1008020160.

The previous prime is 1999559959. The next prime is 1999560001. The reversal of 1999559985 is 5899559991.

It is not a de Polignac number, because 1999559985 - 2⁶ = 1999559921 is a prime.

It is a super-2 number, since 2×1999559985² = 7996480267226400450, which contains 22 as substring.

1999559985 is a modest number, since divided by 59985 gives 19995 as remainder.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30007 + ... + 69996.

It is an arithmetic number, because the mean of its divisors is an integer number (105604224).

Almost surely, 2^1999559985 is an apocalyptic number.

1999559985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1999559985 is a deficient number, since it is larger than the sum of its proper divisors (1379775183).

1999559985 is a wasteful number, since it uses less digits than its factorization.

1999559985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100085.

The product of its digits is 59049000, while the sum is 69.

The square root of 1999559985 is about 44716.4397621278. The cubic root of 1999559985 is about 1259.8286457579.

The spelling of 1999559985 in words is "one billion, nine hundred ninety-nine million, five hundred fifty-nine thousand, nine hundred eighty-five".