12730145 has 4 divisors (see below), whose sum is σ = 15276180. Its totient is φ = 10184112.

The previous prime is 12730121. The next prime is 12730153. The reversal of 12730145 is 54103721.

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 2226064 + 10504081 = 1492^2 + 3241^2 .

It is a cyclic number.

It is not a de Polignac number, because 12730145 - 2¹⁴ = 12713761 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 12730145.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1273010 + ... + 1273019.

It is an arithmetic number, because the mean of its divisors is an integer number (3819045).

Almost surely, 2^12730145 is an apocalyptic number.

It is an amenable number.

12730145 is a deficient number, since it is larger than the sum of its proper divisors (2546035).

12730145 is an equidigital number, since it uses as much as digits as its factorization.

12730145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2546034.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 12730145 is about 3567.9328749291. The cubic root of 12730145 is about 233.4951066352.

Adding to 12730145 its reverse (54103721), we get a palindrome (66833866).

The spelling of 12730145 in words is "twelve million, seven hundred thirty thousand, one hundred forty-five".