12445555 has 4 divisors (see below), whose sum is σ = 14934672. Its totient is φ = 9956440.

The previous prime is 12445549. The next prime is 12445561. The reversal of 12445555 is 55554421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55554421 = 13 ⋅4273417.

It is an interprime number because it is at equal distance from previous prime (12445549) and next prime (12445561).

It is not a de Polignac number, because 12445555 - 2¹⁵ = 12412787 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a plaindrome in base 10.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1244551 + ... + 1244560.

It is an arithmetic number, because the mean of its divisors is an integer number (3733668).

Almost surely, 2^12445555 is an apocalyptic number.

12445555 is a deficient number, since it is larger than the sum of its proper divisors (2489117).

12445555 is an equidigital number, since it uses as much as digits as its factorization.

12445555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2489116.

The product of its digits is 20000, while the sum is 31.

The square root of 12445555 is about 3527.8258176957. The cubic root of 12445555 is about 231.7420028839.

Adding to 12445555 its reverse (55554421), we get a palindrome (67999976).

The spelling of 12445555 in words is "twelve million, four hundred forty-five thousand, five hundred fifty-five".