12209005 has 4 divisors (see below), whose sum is σ = 14650812. Its totient is φ = 9767200.

The previous prime is 12209003. The next prime is 12209011. The reversal of 12209005 is 50090221.

12209005 is nontrivially palindromic in base 11.

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 5391684 + 6817321 = 2322^2 + 2611^2 .

It is not a de Polignac number, because 12209005 - 2¹ = 12209003 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12209003) 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, 1220896 + ... + 1220905.

It is an arithmetic number, because the mean of its divisors is an integer number (3662703).

Almost surely, 2^12209005 is an apocalyptic number.

It is an amenable number.

12209005 is a deficient number, since it is larger than the sum of its proper divisors (2441807).

12209005 is an equidigital number, since it uses as much as digits as its factorization.

12209005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2441806.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 12209005 is about 3494.1386635335. The cubic root of 12209005 is about 230.2643777791.

Adding to 12209005 its reverse (50090221), we get a palindrome (62299226).

The spelling of 12209005 in words is "twelve million, two hundred nine thousand, five".