812089 has 4 divisors (see below), whose sum is σ = 814324. Its totient is φ = 809856.

The previous prime is 812081. The next prime is 812101. The reversal of 812089 is 980218.

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 570025 + 242064 = 755^2 + 492^2 .

It is a cyclic number.

It is not a de Polignac number, because 812089 - 2³ = 812081 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (812081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 432 + ... + 1345.

It is an arithmetic number, because the mean of its divisors is an integer number (203581).

2⁸¹²⁰⁸⁹ is an apocalyptic number.

It is an amenable number.

812089 is a deficient number, since it is larger than the sum of its proper divisors (2235).

812089 is a wasteful number, since it uses less digits than its factorization.

812089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2234.

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 812089 is about 901.1598082471. The cubic root of 812089 is about 93.2970422966.

The spelling of 812089 in words is "eight hundred twelve thousand, eighty-nine".