809138 has 8 divisors (see below), whose sum is σ = 1324080. Its totient is φ = 367780.

The previous prime is 809101. The next prime is 809141. The reversal of 809138 is 831908.

It is a happy number.

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 809138.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 809138.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18368 + ... + 18411.

It is an arithmetic number, because the mean of its divisors is an integer number (165510).

2⁸⁰⁹¹³⁸ is an apocalyptic number.

809138 is a deficient number, since it is larger than the sum of its proper divisors (514942).

809138 is a wasteful number, since it uses less digits than its factorization.

809138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36792.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 809138 is about 899.5209836352. The cubic root of 809138 is about 93.1838963501.

The spelling of 809138 in words is "eight hundred nine thousand, one hundred thirty-eight".