1320403439 has 2 divisors, whose sum is σ = 1320403440. Its totient is φ = 1320403438.

The previous prime is 1320403387. The next prime is 1320403463. The reversal of 1320403439 is 9343040231.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1320403439 - 2²⁰ = 1319354863 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1320403939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660201719 + 660201720.

It is an arithmetic number, because the mean of its divisors is an integer number (660201720).

Almost surely, 2^1320403439 is an apocalyptic number.

1320403439 is a deficient number, since it is larger than the sum of its proper divisors (1).

1320403439 is an equidigital number, since it uses as much as digits as its factorization.

1320403439 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 29.

The square root of 1320403439 is about 36337.3559715068. The cubic root of 1320403439 is about 1097.0730559145.

The spelling of 1320403439 in words is "one billion, three hundred twenty million, four hundred three thousand, four hundred thirty-nine".