1328719969 has 4 divisors (see below), whose sum is σ = 1336676544. Its totient is φ = 1320763396.

The previous prime is 1328719963. The next prime is 1328719979. The reversal of 1328719969 is 9699178231.

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.

It is a cyclic number.

It is not a de Polignac number, because 1328719969 - 2¹³ = 1328711777 is a prime.

It is a super-2 number, since 2×1328719969² = 3530993512038721922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1328719963) 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, 3978037 + ... + 3978370.

It is an arithmetic number, because the mean of its divisors is an integer number (334169136).

Almost surely, 2^1328719969 is an apocalyptic number.

It is an amenable number.

1328719969 is a deficient number, since it is larger than the sum of its proper divisors (7956575).

1328719969 is an equidigital number, since it uses as much as digits as its factorization.

1328719969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7956574.

The product of its digits is 1469664, while the sum is 55.

The square root of 1328719969 is about 36451.6113361261. The cubic root of 1328719969 is about 1099.3715332909.

The spelling of 1328719969 in words is "one billion, three hundred twenty-eight million, seven hundred nineteen thousand, nine hundred sixty-nine".