12420545 has 4 divisors (see below), whose sum is σ = 14904660. Its totient is φ = 9936432.

The previous prime is 12420521. The next prime is 12420571. The reversal of 12420545 is 54502421.

It is a happy number.

12420545 is digitally balanced in base 2, 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 3964081 + 8456464 = 1991^2 + 2908^2 .

It is a cyclic number.

It is not a de Polignac number, because 12420545 - 2¹² = 12416449 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12420545.

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, 1242050 + ... + 1242059.

It is an arithmetic number, because the mean of its divisors is an integer number (3726165).

Almost surely, 2^12420545 is an apocalyptic number.

It is an amenable number.

12420545 is a deficient number, since it is larger than the sum of its proper divisors (2484115).

12420545 is an equidigital number, since it uses as much as digits as its factorization.

12420545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2484114.

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 12420545 is about 3524.2793589612. The cubic root of 12420545 is about 231.5866661874.

Adding to 12420545 its reverse (54502421), we get a palindrome (66922966).

The spelling of 12420545 in words is "twelve million, four hundred twenty thousand, five hundred forty-five".