815806 has 8 divisors (see below), whose sum is σ = 1227744. Its totient is φ = 406560.

The previous prime is 815729. The next prime is 815809. The reversal of 815806 is 608518.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (815809) by changing a digit.

815806 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 3 ways as a sum of consecutive naturals, for example, 486 + ... + 1366.

It is an arithmetic number, because the mean of its divisors is an integer number (153468).

2⁸¹⁵⁸⁰⁶ is an apocalyptic number.

815806 is a deficient number, since it is larger than the sum of its proper divisors (411938).

815806 is a wasteful number, since it uses less digits than its factorization.

815806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1346.

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 815806 is about 903.2197960630. The cubic root of 815806 is about 93.4391684918.

The spelling of 815806 in words is "eight hundred fifteen thousand, eight hundred six".