1822 has 4 divisors (see below), whose sum is σ = 2736. Its totient is φ = 910.
The previous prime is 1811. The next prime is 1823. The reversal of 1822 is 2281.
1822 is nontrivially palindromic in base 5.
It is a semiprime because it is the product of two primes.
It is a Smith number, since the sum of its digits (13) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.
It is a fibodiv number, since the Fibonacci-like sequence with seeds 18 and 22 contains 1822 itself.
1822 is an undulating number in base 5.
1822 is a modest number, since divided by 22 gives 18 as remainder.
It is a plaindrome in base 6 and base 9.
It is a nialpdrome in base 3, base 13 and base 14.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (1823) by changing a digit.
1822 is an untouchable number, because it is not equal to the sum of proper divisors of any number.
It is a pernicious number, because its binary representation contains a prime number (7) of ones.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 454 + ... + 457.
It is an arithmetic number, because the mean of its divisors is an integer number (684).
1822 is a deficient number, since it is larger than the sum of its proper divisors (914).
1822 is an equidigital number, since it uses as much as digits as its factorization.
1822 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 913.
The product of its digits is 32, while the sum is 13.
The square root of 1822 is about 42.6848919408. The cubic root of 1822 is about 12.2137621282.
The spelling of 1822 in words is "one thousand, eight hundred twenty-two".
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