3945694128789 has 64 divisors (see below), whose sum is σ = 6333675208704. Its totient is φ = 2136160325376.

The previous prime is 3945694128737. The next prime is 3945694128791. The reversal of 3945694128789 is 9878214965493.

It is not a de Polignac number, because 3945694128789 - 2¹¹ = 3945694126741 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3945694128789.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3945694128689) 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 63 ways as a sum of consecutive naturals, for example, 37549567 + ... + 37654499.

It is an arithmetic number, because the mean of its divisors is an integer number (98963675136).

Almost surely, 2^{3945694128789} is an apocalyptic number.

It is an amenable number.

3945694128789 is a deficient number, since it is larger than the sum of its proper divisors (2387981079915).

3945694128789 is a wasteful number, since it uses less digits than its factorization.

3945694128789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105706.

The product of its digits is 940584960, while the sum is 75.

The spelling of 3945694128789 in words is "three trillion, nine hundred forty-five billion, six hundred ninety-four million, one hundred twenty-eight thousand, seven hundred eighty-nine".