12445813 has 4 divisors (see below), whose sum is σ = 12460140. Its totient is φ = 12431488.

The previous prime is 12445781. The next prime is 12445841. The reversal of 12445813 is 31854421.

12445813 is digitally balanced in base 3, 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 321489 + 12124324 = 567^2 + 3482^2 .

It is a cyclic number.

It is not a de Polignac number, because 12445813 - 2⁵ = 12445781 is a prime.

It is a super-2 number, since 2×12445813² = 309796522461938, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12445883) 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, 5770 + ... + 7627.

It is an arithmetic number, because the mean of its divisors is an integer number (3115035).

Almost surely, 2^12445813 is an apocalyptic number.

It is an amenable number.

12445813 is a deficient number, since it is larger than the sum of its proper divisors (14327).

12445813 is an equidigital number, since it uses as much as digits as its factorization.

12445813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14326.

The product of its digits is 3840, while the sum is 28.

The square root of 12445813 is about 3527.8623839373. The cubic root of 12445813 is about 231.7436042327.

The spelling of 12445813 in words is "twelve million, four hundred forty-five thousand, eight hundred thirteen".