823217 has 4 divisors (see below), whose sum is σ = 826176. Its totient is φ = 820260.

The previous prime is 823201. The next prime is 823219. The reversal of 823217 is 712328.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 823217 - 2⁴ = 823201 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 823192 and 823201.

It is not an unprimeable number, because it can be changed into a prime (823219) 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 in 3 ways as a sum of consecutive naturals, for example, 1013 + ... + 1634.

It is an arithmetic number, because the mean of its divisors is an integer number (206544).

2⁸²³²¹⁷ is an apocalyptic number.

It is an amenable number.

823217 is a deficient number, since it is larger than the sum of its proper divisors (2959).

823217 is a wasteful number, since it uses less digits than its factorization.

823217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2958.

The product of its digits is 672, while the sum is 23.

The square root of 823217 is about 907.3130661464. The cubic root of 823217 is about 93.7212581522.

Subtracting from 823217 its reverse (712328), we obtain a square (110889 = 333²).

It can be divided in two parts, 82321 and 7, that added together give a palindrome (82328).

The spelling of 823217 in words is "eight hundred twenty-three thousand, two hundred seventeen".