1320705923 has 2 divisors, whose sum is σ = 1320705924. Its totient is φ = 1320705922.

The previous prime is 1320705889. The next prime is 1320705929. The reversal of 1320705923 is 3295070231.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1320705923 - 2²² = 1316511619 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1320705923.

It is not a weakly prime, because it can be changed into another prime (1320705929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660352961 + 660352962.

It is an arithmetic number, because the mean of its divisors is an integer number (660352962).

Almost surely, 2^1320705923 is an apocalyptic number.

1320705923 is a deficient number, since it is larger than the sum of its proper divisors (1).

1320705923 is an equidigital number, since it uses as much as digits as its factorization.

1320705923 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11340, while the sum is 32.

The square root of 1320705923 is about 36341.5178962024. The cubic root of 1320705923 is about 1097.1568236730.

The spelling of 1320705923 in words is "one billion, three hundred twenty million, seven hundred five thousand, nine hundred twenty-three".