812506 has 4 divisors (see below), whose sum is σ = 1218762. Its totient is φ = 406252.

The previous prime is 812503. The next prime is 812519. The reversal of 812506 is 605218.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 605218 = 2 ⋅302609.

It can be written as a sum of positive squares in only one way, i.e., 434281 + 378225 = 659^2 + 615^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (812501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203125 + ... + 203128.

2⁸¹²⁵⁰⁶ is an apocalyptic number.

812506 is a deficient number, since it is larger than the sum of its proper divisors (406256).

812506 is a wasteful number, since it uses less digits than its factorization.

812506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406255.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 812506 is about 901.3911470610. The cubic root of 812506 is about 93.3130086129.

The spelling of 812506 in words is "eight hundred twelve thousand, five hundred six".