3973128309 has 12 divisors (see below), whose sum is σ = 5740418476. Its totient is φ = 2648080512.

The previous prime is 3973128241. The next prime is 3973128373. The reversal of 3973128309 is 9038213793.

It can be written as a sum of positive squares in 2 ways, for example, as 1417522500 + 2555605809 = 37650^2 + 50553^2 .

It is not a de Polignac number, because 3973128309 - 2⁸ = 3973128053 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 (3973128389) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17092 + ... + 90765.

Almost surely, 2^3973128309 is an apocalyptic number.

It is an amenable number.

3973128309 is a deficient number, since it is larger than the sum of its proper divisors (1767290167).

3973128309 is a wasteful number, since it uses less digits than its factorization.

3973128309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111956 (or 111953 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 45.

The square root of 3973128309 is about 63032.7558417050. The cubic root of 3973128309 is about 1583.8383828927.

The spelling of 3973128309 in words is "three billion, nine hundred seventy-three million, one hundred twenty-eight thousand, three hundred nine".