1328904971 has 4 divisors (see below), whose sum is σ = 1386683472. Its totient is φ = 1271126472.

The previous prime is 1328904959. The next prime is 1328904979. The reversal of 1328904971 is 1794098231.

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 1328904971 - 2¹⁸ = 1328642827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1328904979) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28889216 + ... + 28889261.

It is an arithmetic number, because the mean of its divisors is an integer number (346670868).

Almost surely, 2^1328904971 is an apocalyptic number.

1328904971 is a deficient number, since it is larger than the sum of its proper divisors (57778501).

1328904971 is an equidigital number, since it uses as much as digits as its factorization.

1328904971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57778500.

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 1328904971 is about 36454.1488859636. The cubic root of 1328904971 is about 1099.4225539470.

The spelling of 1328904971 in words is "one billion, three hundred twenty-eight million, nine hundred four thousand, nine hundred seventy-one".