1985705 has 16 divisors (see below), whose sum is σ = 2571264. Its totient is φ = 1467840.

The previous prime is 1985689. The next prime is 1985713. The reversal of 1985705 is 5075891.

It is not a de Polignac number, because 1985705 - 2⁴ = 1985689 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3287 + ... + 3843.

It is an arithmetic number, because the mean of its divisors is an integer number (160704).

2^1985705 is an apocalyptic number.

It is an amenable number.

1985705 is a deficient number, since it is larger than the sum of its proper divisors (585559).

1985705 is a wasteful number, since it uses less digits than its factorization.

1985705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 616.

The product of its (nonzero) digits is 12600, while the sum is 35.

The square root of 1985705 is about 1409.1504532874. The cubic root of 1985705 is about 125.6912107762.

The spelling of 1985705 in words is "one million, nine hundred eighty-five thousand, seven hundred five".