1982221 has 4 divisors (see below), whose sum is σ = 1987612. Its totient is φ = 1976832.

The previous prime is 1982219. The next prime is 1982263. The reversal of 1982221 is 1222891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1222891 = 313 ⋅3907.

It can be written as a sum of positive squares in 2 ways, for example, as 1010025 + 972196 = 1005^2 + 986^2 .

It is a cyclic number.

It is not a de Polignac number, because 1982221 - 2¹ = 1982219 is a prime.

It is a Duffinian number.

1982221 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1982291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2100 + ... + 2893.

It is an arithmetic number, because the mean of its divisors is an integer number (496903).

2^1982221 is an apocalyptic number.

It is an amenable number.

1982221 is a deficient number, since it is larger than the sum of its proper divisors (5391).

1982221 is an equidigital number, since it uses as much as digits as its factorization.

1982221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5390.

The product of its digits is 576, while the sum is 25.

The square root of 1982221 is about 1407.9137047419. The cubic root of 1982221 is about 125.6176576321.

The spelling of 1982221 in words is "one million, nine hundred eighty-two thousand, two hundred twenty-one".