1320538487 has 4 divisors (see below), whose sum is σ = 1321995336. Its totient is φ = 1319081640.

The previous prime is 1320538481. The next prime is 1320538489. The reversal of 1320538487 is 7848350231.

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

It is a cyclic number.

It is not a de Polignac number, because 1320538487 - 2²⁰ = 1319489911 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320538481) 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, 727064 + ... + 728877.

It is an arithmetic number, because the mean of its divisors is an integer number (330498834).

Almost surely, 2^1320538487 is an apocalyptic number.

1320538487 is a deficient number, since it is larger than the sum of its proper divisors (1456849).

1320538487 is an equidigital number, since it uses as much as digits as its factorization.

1320538487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1456848.

The product of its (nonzero) digits is 161280, while the sum is 41.

The square root of 1320538487 is about 36339.2141769742. The cubic root of 1320538487 is about 1097.1104567237.

The spelling of 1320538487 in words is "one billion, three hundred twenty million, five hundred thirty-eight thousand, four hundred eighty-seven".