12784743209 has 4 divisors (see below), whose sum is σ = 14611135104. Its totient is φ = 10958351316.

The previous prime is 12784743173. The next prime is 12784743227. The reversal of 12784743209 is 90234748721.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12784743209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12784743229) 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, 913195937 + ... + 913195950.

It is an arithmetic number, because the mean of its divisors is an integer number (3652783776).

Almost surely, 2^12784743209 is an apocalyptic number.

It is an amenable number.

12784743209 is a deficient number, since it is larger than the sum of its proper divisors (1826391895).

12784743209 is an equidigital number, since it uses as much as digits as its factorization.

12784743209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1826391894.

The product of its (nonzero) digits is 677376, while the sum is 47.

The spelling of 12784743209 in words is "twelve billion, seven hundred eighty-four million, seven hundred forty-three thousand, two hundred nine".