801805 has 8 divisors (see below), whose sum is σ = 1018872. Its totient is φ = 603648.

The previous prime is 801791. The next prime is 801809. The reversal of 801805 is 508108.

It can be written as a sum of positive squares in 4 ways, for example, as 233289 + 568516 = 483^2 + 754^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 801805 - 2⁷ = 801677 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (801809) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4632 + ... + 4801.

It is an arithmetic number, because the mean of its divisors is an integer number (127359).

2⁸⁰¹⁸⁰⁵ is an apocalyptic number.

801805 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

It is an amenable number.

801805 is a deficient number, since it is larger than the sum of its proper divisors (217067).

801805 is a wasteful number, since it uses less digits than its factorization.

801805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9455.

The product of its (nonzero) digits is 320, while the sum is 22.

The square root of 801805 is about 895.4356481624. The cubic root of 801805 is about 92.9015414616.

It can be divided in two parts, 80 and 1805, that multiplied together give a square (144400 = 380²).

The spelling of 801805 in words is "eight hundred one thousand, eight hundred five".