812065 has 4 divisors (see below), whose sum is σ = 974484. Its totient is φ = 649648.

The previous prime is 812057. The next prime is 812081. The reversal of 812065 is 560218.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 646416 + 165649 = 804^2 + 407^2 .

It is a cyclic number.

It is not a de Polignac number, because 812065 - 2³ = 812057 is a prime.

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 a Duffinian number.

It is a nialpdrome in base 16.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81202 + ... + 81211.

It is an arithmetic number, because the mean of its divisors is an integer number (243621).

2⁸¹²⁰⁶⁵ is an apocalyptic number.

It is an amenable number.

812065 is a deficient number, since it is larger than the sum of its proper divisors (162419).

812065 is a wasteful number, since it uses less digits than its factorization.

812065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162418.

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

The square root of 812065 is about 901.1464919756. The cubic root of 812065 is about 93.2961232056.

The spelling of 812065 in words is "eight hundred twelve thousand, sixty-five".