1821322 has 4 divisors (see below), whose sum is σ = 2731986. Its totient is φ = 910660.

The previous prime is 1821319. The next prime is 1821331. The reversal of 1821322 is 2231281.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2231281 = 13 ⋅171637.

It can be written as a sum of positive squares in only one way, i.e., 1819801 + 1521 = 1349^2 + 39^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1821322.

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 as a sum of consecutive naturals, namely, 455329 + ... + 455332.

2^1821322 is an apocalyptic number.

1821322 is a deficient number, since it is larger than the sum of its proper divisors (910664).

1821322 is an equidigital number, since it uses as much as digits as its factorization.

1821322 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 910663.

The product of its digits is 192, while the sum is 19.

The square root of 1821322 is about 1349.5636331793. The cubic root of 1821322 is about 122.1224695111.

The spelling of 1821322 in words is "one million, eight hundred twenty-one thousand, three hundred twenty-two".