809123 has 4 divisors (see below), whose sum is σ = 924720. Its totient is φ = 693528.

The previous prime is 809101. The next prime is 809141. The reversal of 809123 is 321908.

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 809123 - 2⁸ = 808867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (809143) 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, 57788 + ... + 57801.

It is an arithmetic number, because the mean of its divisors is an integer number (231180).

2⁸⁰⁹¹²³ is an apocalyptic number.

809123 is a deficient number, since it is larger than the sum of its proper divisors (115597).

809123 is a wasteful number, since it uses less digits than its factorization.

809123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115596.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 809123 is about 899.5126458255. The cubic root of 809123 is about 93.1833205245.

The spelling of 809123 in words is "eight hundred nine thousand, one hundred twenty-three".