812217 has 8 divisors (see below), whose sum is σ = 1237696. Its totient is φ = 464112.

The previous prime is 812213. The next prime is 812221. The reversal of 812217 is 712218.

812217 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (812213) and next prime (812221).

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

It is not a de Polignac number, because 812217 - 2² = 812213 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 38677 = 812217 / (8 + 1 + 2 + 2 + 1 + 7).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 812193 and 812202.

It is not an unprimeable number, because it can be changed into a prime (812213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19318 + ... + 19359.

It is an arithmetic number, because the mean of its divisors is an integer number (154712).

2⁸¹²²¹⁷ is an apocalyptic number.

It is an amenable number.

812217 is a deficient number, since it is larger than the sum of its proper divisors (425479).

812217 is a wasteful number, since it uses less digits than its factorization.

812217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38687.

The product of its digits is 224, while the sum is 21.

The square root of 812217 is about 901.2308250387. The cubic root of 812217 is about 93.3019438095.

Subtracting from 812217 its reverse (712218), we obtain a palindrome (99999).

The spelling of 812217 in words is "eight hundred twelve thousand, two hundred seventeen".