1982209 has 4 divisors (see below), whose sum is σ = 2068416. Its totient is φ = 1896004.

The previous prime is 1982207. The next prime is 1982219. The reversal of 1982209 is 9022891.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1982209 - 2¹ = 1982207 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1982203) by changing a digit.

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, 43069 + ... + 43114.

It is an arithmetic number, because the mean of its divisors is an integer number (517104).

2^1982209 is an apocalyptic number.

It is an amenable number.

1982209 is a deficient number, since it is larger than the sum of its proper divisors (86207).

1982209 is an equidigital number, since it uses as much as digits as its factorization.

1982209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86206.

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 1982209 is about 1407.9094431106. The cubic root of 1982209 is about 125.6174041429.

It can be divided in two parts, 19 and 82209, that added together give a palindrome (82228).

The spelling of 1982209 in words is "one million, nine hundred eighty-two thousand, two hundred nine".