1705605985 has 16 divisors (see below), whose sum is σ = 2091366864. Its totient is φ = 1334874112.

The previous prime is 1705605959. The next prime is 1705605997. The reversal of 1705605985 is 5895065071.

It can be written as a sum of positive squares in 8 ways, for example, as 7177041 + 1698428944 = 2679^2 + 41212^2 .

It is not a de Polignac number, because 1705605985 - 2¹⁷ = 1705474913 is a prime.

It is a Duffinian 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 15 ways as a sum of consecutive naturals, for example, 84429 + ... + 102661.

It is an arithmetic number, because the mean of its divisors is an integer number (130710429).

Almost surely, 2^1705605985 is an apocalyptic number.

It is an amenable number.

1705605985 is a deficient number, since it is larger than the sum of its proper divisors (385760879).

1705605985 is a wasteful number, since it uses less digits than its factorization.

1705605985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18644.

The product of its (nonzero) digits is 378000, while the sum is 46.

The square root of 1705605985 is about 41298.9828567242. The cubic root of 1705605985 is about 1194.7936444507.

The spelling of 1705605985 in words is "one billion, seven hundred five million, six hundred five thousand, nine hundred eighty-five".