1366667 has 2 divisors, whose sum is σ = 1366668. Its totient is φ = 1366666.

The previous prime is 1366663. The next prime is 1366693. The reversal of 1366667 is 7666631.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1366667 - 2² = 1366663 is a prime.

It is a plaindrome in base 10.

It is not a weakly prime, because it can be changed into another prime (1366661) by changing a digit.

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 as a sum of consecutive naturals, namely, 683333 + 683334.

It is an arithmetic number, because the mean of its divisors is an integer number (683334).

2^1366667 is an apocalyptic number.

1366667 is a deficient number, since it is larger than the sum of its proper divisors (1).

1366667 is an equidigital number, since it uses as much as digits as its factorization.

1366667 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27216, while the sum is 35.

The square root of 1366667 is about 1169.0453370165. The cubic root of 1366667 is about 110.9739137357.

The spelling of 1366667 in words is "one million, three hundred sixty-six thousand, six hundred sixty-seven".