801823 has 4 divisors (see below), whose sum is σ = 874728. Its totient is φ = 728920.

The previous prime is 801817. The next prime is 801833. The reversal of 801823 is 328108.

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

It is a cyclic number.

It is not a de Polignac number, because 801823 - 2⁵ = 801791 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 801794 and 801803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (801833) 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 3 ways as a sum of consecutive naturals, for example, 36436 + ... + 36457.

It is an arithmetic number, because the mean of its divisors is an integer number (218682).

2⁸⁰¹⁸²³ is an apocalyptic number.

801823 is a deficient number, since it is larger than the sum of its proper divisors (72905).

801823 is a wasteful number, since it uses less digits than its factorization.

801823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72904.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 801823 is about 895.4456990795. The cubic root of 801823 is about 92.9022366495.

The spelling of 801823 in words is "eight hundred one thousand, eight hundred twenty-three".