3128726397 has 16 divisors (see below), whose sum is σ = 4299384320. Its totient is φ = 2022641712.

The previous prime is 3128726387. The next prime is 3128726411. The reversal of 3128726397 is 7936278213.

It is not a de Polignac number, because 3128726397 - 2¹² = 3128722301 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 (3128726387) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69313 + ... + 105174.

It is an arithmetic number, because the mean of its divisors is an integer number (268711520).

Almost surely, 2^3128726397 is an apocalyptic number.

It is an amenable number.

3128726397 is a deficient number, since it is larger than the sum of its proper divisors (1170657923).

3128726397 is a wasteful number, since it uses less digits than its factorization.

3128726397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174672.

The product of its digits is 762048, while the sum is 48.

The square root of 3128726397 is about 55935.0194153895. The cubic root of 3128726397 is about 1462.5897609895.

The spelling of 3128726397 in words is "three billion, one hundred twenty-eight million, seven hundred twenty-six thousand, three hundred ninety-seven".