12784229 has 2 divisors, whose sum is σ = 12784230. Its totient is φ = 12784228.

The previous prime is 12784217. The next prime is 12784231. The reversal of 12784229 is 92248721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12061729 + 722500 = 3473^2 + 850^2 .

It is an emirp because it is prime and its reverse (92248721) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12784229 - 2⁸ = 12783973 is a prime.

It is a super-2 number, since 2×12784229² = 326873022248882, which contains 22 as substring.

Together with 12784231, it forms a pair of twin primes.

It is a Chen prime.

It is a zygodrome in base 3.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12784249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6392114 + 6392115.

It is an arithmetic number, because the mean of its divisors is an integer number (6392115).

Almost surely, 2^12784229 is an apocalyptic number.

It is an amenable number.

12784229 is a deficient number, since it is larger than the sum of its proper divisors (1).

12784229 is an equidigital number, since it uses as much as digits as its factorization.

12784229 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16128, while the sum is 35.

The square root of 12784229 is about 3575.5040204145. The cubic root of 12784229 is about 233.8253073150.

The spelling of 12784229 in words is "twelve million, seven hundred eighty-four thousand, two hundred twenty-nine".