12440213 has 4 divisors (see below), whose sum is σ = 12674988. Its totient is φ = 12205440.

The previous prime is 12440203. The next prime is 12440221. The reversal of 12440213 is 31204421.

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 8898289 + 3541924 = 2983^2 + 1882^2 .

It is a cyclic number.

It is not a de Polignac number, because 12440213 - 2²⁰ = 11391637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12440191 and 12440200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12440203) 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, 117308 + ... + 117413.

It is an arithmetic number, because the mean of its divisors is an integer number (3168747).

Almost surely, 2^12440213 is an apocalyptic number.

It is an amenable number.

12440213 is a deficient number, since it is larger than the sum of its proper divisors (234775).

12440213 is an equidigital number, since it uses as much as digits as its factorization.

12440213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234774.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 12440213 is about 3527.0686128852. The cubic root of 12440213 is about 231.7088413001.

Adding to 12440213 its reverse (31204421), we get a palindrome (43644634).

The spelling of 12440213 in words is "twelve million, four hundred forty thousand, two hundred thirteen".