1320287 has 2 divisors, whose sum is σ = 1320288. Its totient is φ = 1320286.

The previous prime is 1320251. The next prime is 1320301. The reversal of 1320287 is 7820231.

It is a strong prime.

It is an emirp because it is prime and its reverse (7820231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1320287 - 2⁸ = 1320031 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1320247) 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, 660143 + 660144.

It is an arithmetic number, because the mean of its divisors is an integer number (660144).

2^1320287 is an apocalyptic number.

1320287 is a deficient number, since it is larger than the sum of its proper divisors (1).

1320287 is an equidigital number, since it uses as much as digits as its factorization.

1320287 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 1320287 is about 1149.0374232374. The cubic root of 1320287 is about 109.7040806719.

The spelling of 1320287 in words is "one million, three hundred twenty thousand, two hundred eighty-seven".