1366657 has 2 divisors, whose sum is σ = 1366658. Its totient is φ = 1366656.

The previous prime is 1366649. The next prime is 1366661. The reversal of 1366657 is 7566631.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1100401 + 266256 = 1049^2 + 516^2 .

It is a cyclic number.

It is not a de Polignac number, because 1366657 - 2³ = 1366649 is a prime.

It is not a weakly prime, because it can be changed into another prime (1366627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 683328 + 683329.

It is an arithmetic number, because the mean of its divisors is an integer number (683329).

2^1366657 is an apocalyptic number.

It is an amenable number.

1366657 is a deficient number, since it is larger than the sum of its proper divisors (1).

1366657 is an equidigital number, since it uses as much as digits as its factorization.

1366657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22680, while the sum is 34.

The square root of 1366657 is about 1169.0410600146. The cubic root of 1366657 is about 110.9736430670.

The spelling of 1366657 in words is "one million, three hundred sixty-six thousand, six hundred fifty-seven".