1366389 has 12 divisors (see below), whose sum is σ = 2047136. Its totient is φ = 910764.

The previous prime is 1366367. The next prime is 1366397. The reversal of 1366389 is 9836631.

It is a happy number.

1366389 is a `hidden beast` number, since 13 + 6 + 638 + 9 = 666.

It is not a de Polignac number, because 1366389 - 2⁹ = 1365877 is a prime.

It is a Duffinian number.

1366389 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1366349) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2569 + ... + 3054.

2^1366389 is an apocalyptic number.

It is an amenable number.

1366389 is a deficient number, since it is larger than the sum of its proper divisors (680747).

1366389 is an frugal number, since it uses more digits than its factorization.

1366389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5638 (or 5626 counting only the distinct ones).

The product of its digits is 23328, while the sum is 36.

The square root of 1366389 is about 1168.9264305336. The cubic root of 1366389 is about 110.9663886546.

The spelling of 1366389 in words is "one million, three hundred sixty-six thousand, three hundred eighty-nine".