12784817 has 2 divisors, whose sum is σ = 12784818. Its totient is φ = 12784816.

The previous prime is 12784789. The next prime is 12784823. The reversal of 12784817 is 71848721.

12784817 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12666481 + 118336 = 3559^2 + 344^2 .

It is a cyclic number.

It is not a de Polignac number, because 12784817 - 2²² = 8590513 is a prime.

It is not a weakly prime, because it can be changed into another prime (12784847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6392408 + 6392409.

It is an arithmetic number, because the mean of its divisors is an integer number (6392409).

Almost surely, 2^12784817 is an apocalyptic number.

It is an amenable number.

12784817 is a deficient number, since it is larger than the sum of its proper divisors (1).

12784817 is an equidigital number, since it uses as much as digits as its factorization.

12784817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25088, while the sum is 38.

The square root of 12784817 is about 3575.5862456386. The cubic root of 12784817 is about 233.8288921270.

The spelling of 12784817 in words is "twelve million, seven hundred eighty-four thousand, eight hundred seventeen".