12240306 has 72 divisors (see below), whose sum is σ = 30507204. Its totient is φ = 3525120.

The previous prime is 12240299. The next prime is 12240311. The reversal of 12240306 is 60304221.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 3294225 + 8946081 = 1815^2 + 2991^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is an unprimeable number.

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 35 ways as a sum of consecutive naturals, for example, 67536 + ... + 67716.

Almost surely, 2^12240306 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12240306, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15253602).

12240306 is an abundant number, since it is smaller than the sum of its proper divisors (18266898).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12240306 is a wasteful number, since it uses less digits than its factorization.

12240306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236 (or 216 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 12240306 is about 3498.6148687731. The cubic root of 12240306 is about 230.4609909785.

Adding to 12240306 its reverse (60304221), we get a palindrome (72544527).

The spelling of 12240306 in words is "twelve million, two hundred forty thousand, three hundred six".