1328791039 has 4 divisors (see below), whose sum is σ = 1333326456. Its totient is φ = 1324255624.

The previous prime is 1328791021. The next prime is 1328791067. The reversal of 1328791039 is 9301978231.

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 1328791039 - 2²³ = 1320402431 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1328790986 and 1328791004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1328791439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2267269 + ... + 2267854.

It is an arithmetic number, because the mean of its divisors is an integer number (333331614).

Almost surely, 2^1328791039 is an apocalyptic number.

1328791039 is a deficient number, since it is larger than the sum of its proper divisors (4535417).

1328791039 is an equidigital number, since it uses as much as digits as its factorization.

1328791039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4535416.

The product of its (nonzero) digits is 81648, while the sum is 43.

The square root of 1328791039 is about 36452.5861771151. The cubic root of 1328791039 is about 1099.3911338447.

The spelling of 1328791039 in words is "one billion, three hundred twenty-eight million, seven hundred ninety-one thousand, thirty-nine".