822215 has 4 divisors (see below), whose sum is σ = 986664. Its totient is φ = 657768.

The previous prime is 822197. The next prime is 822221. The reversal of 822215 is 512228.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-822215 is a prime.

It is a Duffinian number.

It is a plaindrome in base 12.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 822215.

It is an unprimeable number.

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, 82217 + ... + 82226.

It is an arithmetic number, because the mean of its divisors is an integer number (246666).

2⁸²²²¹⁵ is an apocalyptic number.

822215 is a deficient number, since it is larger than the sum of its proper divisors (164449).

822215 is a wasteful number, since it uses less digits than its factorization.

822215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164448.

The product of its digits is 320, while the sum is 20.

The square root of 822215 is about 906.7607181611. The cubic root of 822215 is about 93.6832176244.

The spelling of 822215 in words is "eight hundred twenty-two thousand, two hundred fifteen".