1366555 has 4 divisors (see below), whose sum is σ = 1639872. Its totient is φ = 1093240.

The previous prime is 1366549. The next prime is 1366577. The reversal of 1366555 is 5556631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5556631 = 127 ⋅43753.

It is not a de Polignac number, because 1366555 - 2⁵ = 1366523 is a prime.

It is a Duffinian number.

1366555 is a lucky 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 3 ways as a sum of consecutive naturals, for example, 136651 + ... + 136660.

It is an arithmetic number, because the mean of its divisors is an integer number (409968).

2^1366555 is an apocalyptic number.

1366555 is a deficient number, since it is larger than the sum of its proper divisors (273317).

1366555 is an equidigital number, since it uses as much as digits as its factorization.

1366555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273316.

The product of its digits is 13500, while the sum is 31.

The square root of 1366555 is about 1168.9974337012. The cubic root of 1366555 is about 110.9708821711.

The spelling of 1366555 in words is "one million, three hundred sixty-six thousand, five hundred fifty-five".