11982209 has 4 divisors (see below), whose sum is σ = 12274500. Its totient is φ = 11689920.

The previous prime is 11982203. The next prime is 11982211. The reversal of 11982209 is 90228911.

It is a happy number.

11982209 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 739600 + 11242609 = 860^2 + 3353^2 .

It is not a de Polignac number, because 11982209 - 2²⁰ = 10933633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11982203) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 146084 + ... + 146165.

It is an arithmetic number, because the mean of its divisors is an integer number (3068625).

Almost surely, 2^11982209 is an apocalyptic number.

It is an amenable number.

11982209 is a deficient number, since it is larger than the sum of its proper divisors (292291).

11982209 is an equidigital number, since it uses as much as digits as its factorization.

11982209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292290.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 11982209 is about 3461.5327529867. The cubic root of 11982209 is about 228.8296502664.

It can be divided in two parts, 119 and 82209, that added together give a palindrome (82328).

The spelling of 11982209 in words is "eleven million, nine hundred eighty-two thousand, two hundred nine".