12440305 has 4 divisors (see below), whose sum is σ = 14928372. Its totient is φ = 9952240.

The previous prime is 12440293. The next prime is 12440317. The reversal of 12440305 is 50304421.

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

It is an interprime number because it is at equal distance from previous prime (12440293) and next prime (12440317).

It can be written as a sum of positive squares in 2 ways, for example, as 4397409 + 8042896 = 2097^2 + 2836^2 .

It is not a de Polignac number, because 12440305 - 2⁵ = 12440273 is a prime.

It is a super-2 number, since 2×12440305² = 309522376986050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1244026 + ... + 1244035.

It is an arithmetic number, because the mean of its divisors is an integer number (3732093).

Almost surely, 2^12440305 is an apocalyptic number.

It is an amenable number.

12440305 is a deficient number, since it is larger than the sum of its proper divisors (2488067).

12440305 is an equidigital number, since it uses as much as digits as its factorization.

12440305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2488066.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 12440305 is about 3527.0816548529. The cubic root of 12440305 is about 231.7094124897.

Adding to 12440305 its reverse (50304421), we get a palindrome (62744726).

The spelling of 12440305 in words is "twelve million, four hundred forty thousand, three hundred five".