1366385 has 12 divisors (see below), whose sum is σ = 1732788. Its totient is φ = 1034208.

The previous prime is 1366367. The next prime is 1366397. The reversal of 1366385 is 5836631.

It can be written as a sum of positive squares in 2 ways, for example, as 667489 + 698896 = 817^2 + 836^2 .

It is not a de Polignac number, because 1366385 - 2¹⁰ = 1365361 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1427 + ... + 2183.

It is an arithmetic number, because the mean of its divisors is an integer number (144399).

2^1366385 is an apocalyptic number.

It is an amenable number.

1366385 is a deficient number, since it is larger than the sum of its proper divisors (366403).

1366385 is an equidigital number, since it uses as much as digits as its factorization.

1366385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 800 (or 781 counting only the distinct ones).

The product of its digits is 12960, while the sum is 32.

The square root of 1366385 is about 1168.9247195607. The cubic root of 1366385 is about 110.9662803726.

The spelling of 1366385 in words is "one million, three hundred sixty-six thousand, three hundred eighty-five".