801985 has 4 divisors (see below), whose sum is σ = 962388. Its totient is φ = 641584.

The previous prime is 801973. The next prime is 801989. The reversal of 801985 is 589108.

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 199809 + 602176 = 447^2 + 776^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-801985 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (801989) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80194 + ... + 80203.

It is an arithmetic number, because the mean of its divisors is an integer number (240597).

2⁸⁰¹⁹⁸⁵ is an apocalyptic number.

It is an amenable number.

801985 is a deficient number, since it is larger than the sum of its proper divisors (160403).

801985 is a wasteful number, since it uses less digits than its factorization.

801985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160402.

The product of its (nonzero) digits is 2880, while the sum is 31.

The square root of 801985 is about 895.5361522574. The cubic root of 801985 is about 92.9084928718.

The spelling of 801985 in words is "eight hundred one thousand, nine hundred eighty-five".