12783305 has 4 divisors (see below), whose sum is σ = 15339972. Its totient is φ = 10226640.

The previous prime is 12783299. The next prime is 12783307. The reversal of 12783305 is 50338721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50338721 = 79 ⋅637199.

It can be written as a sum of positive squares in 2 ways, for example, as 9066121 + 3717184 = 3011^2 + 1928^2 .

It is not a de Polignac number, because 12783305 - 2⁸ = 12783049 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12783307) by changing a digit.

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, 1278326 + ... + 1278335.

It is an arithmetic number, because the mean of its divisors is an integer number (3834993).

Almost surely, 2^12783305 is an apocalyptic number.

It is an amenable number.

12783305 is a deficient number, since it is larger than the sum of its proper divisors (2556667).

12783305 is an equidigital number, since it uses as much as digits as its factorization.

12783305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2556666.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 12783305 is about 3575.3748055274. The cubic root of 12783305 is about 233.8196738169.

The spelling of 12783305 in words is "twelve million, seven hundred eighty-three thousand, three hundred five".