1985305 has 16 divisors (see below), whose sum is σ = 2749824. Its totient is φ = 1347840.

The previous prime is 1985303. The next prime is 1985317. The reversal of 1985305 is 5035891.

It is not a de Polignac number, because 1985305 - 2¹ = 1985303 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1985303) by changing a digit.

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, 4369 + ... + 4801.

It is an arithmetic number, because the mean of its divisors is an integer number (171864).

2^1985305 is an apocalyptic number.

It is an amenable number.

1985305 is a deficient number, since it is larger than the sum of its proper divisors (764519).

1985305 is a wasteful number, since it uses less digits than its factorization.

1985305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 576.

The product of its (nonzero) digits is 5400, while the sum is 31.

The square root of 1985305 is about 1409.0085166528. The cubic root of 1985305 is about 125.6827704723.

The spelling of 1985305 in words is "one million, nine hundred eighty-five thousand, three hundred five".