809838 has 20 divisors (see below), whose sum is σ = 1815000. Its totient is φ = 269892.

The previous prime is 809833. The next prime is 809839. The reversal of 809838 is 838908.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (809833) by changing a digit.

809838 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 2338 + ... + 2661.

It is an arithmetic number, because the mean of its divisors is an integer number (90750).

2⁸⁰⁹⁸³⁸ is an apocalyptic number.

809838 is an abundant number, since it is smaller than the sum of its proper divisors (1005162).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

809838 is a wasteful number, since it uses less digits than its factorization.

809838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5013 (or 5004 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 809838 is about 899.9099954995. The cubic root of 809838 is about 93.2107602993.

The spelling of 809838 in words is "eight hundred nine thousand, eight hundred thirty-eight".