3128721383 has 4 divisors (see below), whose sum is σ = 3131149920. Its totient is φ = 3126292848.

The previous prime is 3128721373. The next prime is 3128721413. The reversal of 3128721383 is 3831278213.

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 3128721383 - 2⁴ = 3128721367 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 (3128721353) 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, 1212335 + ... + 1214912.

It is an arithmetic number, because the mean of its divisors is an integer number (782787480).

Almost surely, 2^3128721383 is an apocalyptic number.

3128721383 is a deficient number, since it is larger than the sum of its proper divisors (2428537).

3128721383 is a wasteful number, since it uses less digits than its factorization.

3128721383 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2428536.

The product of its digits is 48384, while the sum is 38.

The square root of 3128721383 is about 55934.9745955069. The cubic root of 3128721383 is about 1462.5889796887.

Adding to 3128721383 its reverse (3831278213), we get a palindrome (6959999596).

The spelling of 3128721383 in words is "three billion, one hundred twenty-eight million, seven hundred twenty-one thousand, three hundred eighty-three".