159785 has 4 divisors (see below), whose sum is σ = 191748. Its totient is φ = 127824.

The previous prime is 159779. The next prime is 159787. The reversal of 159785 is 587951.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 94249 + 65536 = 307^2 + 256^2 .

It is a cyclic number.

It is not a de Polignac number, because 159785 - 2⁴ = 159769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (159787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15974 + ... + 15983.

It is an arithmetic number, because the mean of its divisors is an integer number (47937).

2¹⁵⁹⁷⁸⁵ is an apocalyptic number.

It is an amenable number.

159785 is a deficient number, since it is larger than the sum of its proper divisors (31963).

159785 is an equidigital number, since it uses as much as digits as its factorization.

159785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31962.

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

The square root of 159785 is about 399.7311596561. The cubic root of 159785 is about 54.2640247741.

The spelling of 159785 in words is "one hundred fifty-nine thousand, seven hundred eighty-five".