1320120787 has 4 divisors (see below), whose sum is σ = 1320675760. Its totient is φ = 1319565816.

The previous prime is 1320120761. The next prime is 1320120799. The reversal of 1320120787 is 7870210231.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1320120787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1320120287) 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 in 3 ways as a sum of consecutive naturals, for example, 273903 + ... + 278680.

It is an arithmetic number, because the mean of its divisors is an integer number (330168940).

Almost surely, 2^1320120787 is an apocalyptic number.

1320120787 is a deficient number, since it is larger than the sum of its proper divisors (554973).

1320120787 is an equidigital number, since it uses as much as digits as its factorization.

1320120787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 554972.

The product of its (nonzero) digits is 4704, while the sum is 31.

The square root of 1320120787 is about 36333.4664875236. The cubic root of 1320120787 is about 1096.9947687251.

The spelling of 1320120787 in words is "one billion, three hundred twenty million, one hundred twenty thousand, seven hundred eighty-seven".