810005 has 8 divisors (see below), whose sum is σ = 1110912. Its totient is φ = 555408.

The previous prime is 809993. The next prime is 810013. The reversal of 810005 is 500018.

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

It is not a de Polignac number, because 810005 - 2⁸ = 809749 is a prime.

It is a super-2 number, since 2×810005² = 1312216200050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11537 + ... + 11606.

It is an arithmetic number, because the mean of its divisors is an integer number (138864).

2⁸¹⁰⁰⁰⁵ is an apocalyptic number.

It is an amenable number.

810005 is a deficient number, since it is larger than the sum of its proper divisors (300907).

810005 is a wasteful number, since it uses less digits than its factorization.

810005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23155.

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 810005 is about 900.0027777735. The cubic root of 810005 is about 93.2171669827.

The spelling of 810005 in words is "eight hundred ten thousand, five".