3961107387729 has 16 divisors (see below), whose sum is σ = 5955893919040. Its totient is φ = 2601324253440.

The previous prime is 3961107387607. The next prime is 3961107387749. The reversal of 3961107387729 is 9277837011693.

3961107387729 is a `hidden beast` number, since 3 + 9 + 611 + 0 + 7 + 3 + 8 + 7 + 7 + 2 + 9 = 666.

It is not a de Polignac number, because 3961107387729 - 2¹² = 3961107383633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3961107387749) 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, 1094831632 + ... + 1094835249.

It is an arithmetic number, because the mean of its divisors is an integer number (372243369940).

Almost surely, 2^{3961107387729} is an apocalyptic number.

It is an amenable number.

3961107387729 is a deficient number, since it is larger than the sum of its proper divisors (1994786531311).

3961107387729 is a wasteful number, since it uses less digits than its factorization.

3961107387729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2189666957 (or 2189666951 counting only the distinct ones).

The product of its (nonzero) digits is 24004512, while the sum is 63.

The spelling of 3961107387729 in words is "three trillion, nine hundred sixty-one billion, one hundred seven million, three hundred eighty-seven thousand, seven hundred twenty-nine".