1366889 has 2 divisors, whose sum is σ = 1366890. Its totient is φ = 1366888.

The previous prime is 1366877. The next prime is 1366903. The reversal of 1366889 is 9886631.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 714025 + 652864 = 845^2 + 808^2 .

It is a cyclic number.

It is not a de Polignac number, because 1366889 - 2¹⁶ = 1301353 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a plaindrome in base 10.

It is not a weakly prime, because it can be changed into another prime (1366829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 683444 + 683445.

It is an arithmetic number, because the mean of its divisors is an integer number (683445).

2^1366889 is an apocalyptic number.

It is an amenable number.

1366889 is a deficient number, since it is larger than the sum of its proper divisors (1).

1366889 is an equidigital number, since it uses as much as digits as its factorization.

1366889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 41.

The square root of 1366889 is about 1169.1402824298. The cubic root of 1366889 is about 110.9799222404.

The spelling of 1366889 in words is "one million, three hundred sixty-six thousand, eight hundred eighty-nine".