922821 has 8 divisors (see below), whose sum is σ = 1239840. Its totient is φ = 610512.

The previous prime is 922813. The next prime is 922853. The reversal of 922821 is 128229.

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

It is not a de Polignac number, because 922821 - 2³ = 922813 is a prime.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

It is a plaindrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 922791 and 922800.

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 922821.

It is not an unprimeable number, because it can be changed into a prime (922861) 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, 690 + ... + 1523.

It is an arithmetic number, because the mean of its divisors is an integer number (154980).

2⁹²²⁸²¹ is an apocalyptic number.

It is an amenable number.

922821 is a deficient number, since it is larger than the sum of its proper divisors (317019).

922821 is a wasteful number, since it uses less digits than its factorization.

922821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2355.

The product of its digits is 576, while the sum is 24.

The square root of 922821 is about 960.6357270058. The cubic root of 922821 is about 97.3581896340.

The spelling of 922821 in words is "nine hundred twenty-two thousand, eight hundred twenty-one".