1328905129 has 4 divisors (see below), whose sum is σ = 1336329360. Its totient is φ = 1321480900.

The previous prime is 1328905121. The next prime is 1328905157. The reversal of 1328905129 is 9215098231.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9215098231 = 37363 ⋅246637.

It is a cyclic number.

It is not a de Polignac number, because 1328905129 - 2³ = 1328905121 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1328905091 and 1328905100.

It is not an unprimeable number, because it can be changed into a prime (1328905121) 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, 3711847 + ... + 3712204.

It is an arithmetic number, because the mean of its divisors is an integer number (334082340).

Almost surely, 2^1328905129 is an apocalyptic number.

It is an amenable number.

1328905129 is a deficient number, since it is larger than the sum of its proper divisors (7424231).

1328905129 is an equidigital number, since it uses as much as digits as its factorization.

1328905129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7424230.

The product of its (nonzero) digits is 38880, while the sum is 40.

The square root of 1328905129 is about 36454.1510530694. The cubic root of 1328905129 is about 1099.4225975189.

The spelling of 1328905129 in words is "one billion, three hundred twenty-eight million, nine hundred five thousand, one hundred twenty-nine".