12840769 has 2 divisors, whose sum is σ = 12840770. Its totient is φ = 12840768.

The previous prime is 12840761. The next prime is 12840781. The reversal of 12840769 is 96704821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11641744 + 1199025 = 3412^2 + 1095^2 .

It is a cyclic number.

It is not a de Polignac number, because 12840769 - 2³ = 12840761 is a prime.

It is a super-2 number, since 2×12840769² = 329770697022722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (12840761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6420384 + 6420385.

It is an arithmetic number, because the mean of its divisors is an integer number (6420385).

Almost surely, 2^12840769 is an apocalyptic number.

It is an amenable number.

12840769 is a deficient number, since it is larger than the sum of its proper divisors (1).

12840769 is an equidigital number, since it uses as much as digits as its factorization.

12840769 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 12840769 is about 3583.4018753135. The cubic root of 12840769 is about 234.1695085133.

The spelling of 12840769 in words is "twelve million, eight hundred forty thousand, seven hundred sixty-nine".