1320120805 has 32 divisors (see below), whose sum is σ = 1704374784. Its totient is φ = 978087936.

The previous prime is 1320120799. The next prime is 1320120847. The reversal of 1320120805 is 5080210231.

It is a cyclic number.

It is not a de Polignac number, because 1320120805 - 2¹³ = 1320112613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 in 31 ways as a sum of consecutive naturals, for example, 1603624 + ... + 1604446.

It is an arithmetic number, because the mean of its divisors is an integer number (53261712).

Almost surely, 2^1320120805 is an apocalyptic number.

It is an amenable number.

1320120805 is a deficient number, since it is larger than the sum of its proper divisors (384253979).

1320120805 is a wasteful number, since it uses less digits than its factorization.

1320120805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1125.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 1320120805 is about 36333.4667352291. The cubic root of 1320120805 is about 1096.9947737109.

The spelling of 1320120805 in words is "one billion, three hundred twenty million, one hundred twenty thousand, eight hundred five".