12730505 has 4 divisors (see below), whose sum is σ = 15276612. Its totient is φ = 10184400.

The previous prime is 12730493. The next prime is 12730511. The reversal of 12730505 is 50503721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50503721 = 2137 ⋅23633.

It can be written as a sum of positive squares in 2 ways, for example, as 3225616 + 9504889 = 1796^2 + 3083^2 .

It is not a de Polignac number, because 12730505 - 2²² = 8536201 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1273046 + ... + 1273055.

It is an arithmetic number, because the mean of its divisors is an integer number (3819153).

Almost surely, 2^12730505 is an apocalyptic number.

It is an amenable number.

12730505 is a deficient number, since it is larger than the sum of its proper divisors (2546107).

12730505 is an equidigital number, since it uses as much as digits as its factorization.

12730505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2546106.

The product of its (nonzero) digits is 1050, while the sum is 23.

The square root of 12730505 is about 3567.9833239521. The cubic root of 12730505 is about 233.4973076430.

The spelling of 12730505 in words is "twelve million, seven hundred thirty thousand, five hundred five".