1224809 has 2 divisors, whose sum is σ = 1224810. Its totient is φ = 1224808.

The previous prime is 1224767. The next prime is 1224823. The reversal of 1224809 is 9084221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1149184 + 75625 = 1072^2 + 275^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1224809 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1224859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 612404 + 612405.

It is an arithmetic number, because the mean of its divisors is an integer number (612405).

2^1224809 is an apocalyptic number.

It is an amenable number.

1224809 is a deficient number, since it is larger than the sum of its proper divisors (1).

1224809 is an equidigital number, since it uses as much as digits as its factorization.

1224809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 1224809 is about 1106.7108926906. The cubic root of 1224809 is about 106.9931867441.

The spelling of 1224809 in words is "one million, two hundred twenty-four thousand, eight hundred nine".