1385809 has 2 divisors, whose sum is σ = 1385810. Its totient is φ = 1385808.

The previous prime is 1385801. The next prime is 1385827. The reversal of 1385809 is 9085831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1380625 + 5184 = 1175^2 + 72^2 .

It is a cyclic number.

It is not a de Polignac number, because 1385809 - 2³ = 1385801 is a prime.

It is not a weakly prime, because it can be changed into another prime (1385801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 692904 + 692905.

It is an arithmetic number, because the mean of its divisors is an integer number (692905).

2^1385809 is an apocalyptic number.

It is an amenable number.

1385809 is a deficient number, since it is larger than the sum of its proper divisors (1).

1385809 is an equidigital number, since it uses as much as digits as its factorization.

1385809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 1385809 is about 1177.2038905814. The cubic root of 1385809 is about 111.4896261471.

The spelling of 1385809 in words is "one million, three hundred eighty-five thousand, eight hundred nine".