1366623 has 6 divisors (see below), whose sum is σ = 1974024. Its totient is φ = 911076.

The previous prime is 1366609. The next prime is 1366627. The reversal of 1366623 is 3266631.

It is not a de Polignac number, because 1366623 - 2⁸ = 1366367 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1366627) 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 in 5 ways as a sum of consecutive naturals, for example, 75915 + ... + 75932.

It is an arithmetic number, because the mean of its divisors is an integer number (329004).

2^1366623 is an apocalyptic number.

1366623 is a deficient number, since it is larger than the sum of its proper divisors (607401).

1366623 is a wasteful number, since it uses less digits than its factorization.

1366623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151853 (or 151850 counting only the distinct ones).

The product of its digits is 3888, while the sum is 27.

The square root of 1366623 is about 1169.0265180910. The cubic root of 1366623 is about 110.9727227837.

It can be divided in two parts, 13666 and 23, that added together give a square (13689 = 117²).

The spelling of 1366623 in words is "one million, three hundred sixty-six thousand, six hundred twenty-three".