12783289 has 4 divisors (see below), whose sum is σ = 12807460. Its totient is φ = 12759120.

The previous prime is 12783283. The next prime is 12783293. The reversal of 12783289 is 98238721.

12783289 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 1946025 + 10837264 = 1395^2 + 3292^2 .

It is a cyclic number.

It is not a de Polignac number, because 12783289 - 2⁷ = 12783161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12783283) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11274 + ... + 12355.

It is an arithmetic number, because the mean of its divisors is an integer number (3201865).

Almost surely, 2^12783289 is an apocalyptic number.

It is an amenable number.

12783289 is a deficient number, since it is larger than the sum of its proper divisors (24171).

12783289 is an equidigital number, since it uses as much as digits as its factorization.

12783289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24170.

The product of its digits is 48384, while the sum is 40.

The square root of 12783289 is about 3575.3725679990. The cubic root of 12783289 is about 233.8195762648.

The spelling of 12783289 in words is "twelve million, seven hundred eighty-three thousand, two hundred eighty-nine".