3128684399 has 4 divisors (see below), whose sum is σ = 3135747336. Its totient is φ = 3121621464.

The previous prime is 3128684371. The next prime is 3128684407. The reversal of 3128684399 is 9934868213.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3128684399 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3128684399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3128644399) 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, 3530804 + ... + 3531689.

It is an arithmetic number, because the mean of its divisors is an integer number (783936834).

Almost surely, 2^3128684399 is an apocalyptic number.

3128684399 is a deficient number, since it is larger than the sum of its proper divisors (7062937).

3128684399 is an equidigital number, since it uses as much as digits as its factorization.

3128684399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7062936.

The product of its digits is 2239488, while the sum is 53.

The square root of 3128684399 is about 55934.6439963642. The cubic root of 3128684399 is about 1462.5832166738.

The spelling of 3128684399 in words is "three billion, one hundred twenty-eight million, six hundred eighty-four thousand, three hundred ninety-nine".