3971006729 has 4 divisors (see below), whose sum is σ = 3973488660. Its totient is φ = 3968524800.

The previous prime is 3971006723. The next prime is 3971006779. The reversal of 3971006729 is 9276001793.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9276001793 = 35051 ⋅264643.

It can be written as a sum of positive squares in 2 ways, for example, as 3416168704 + 554838025 = 58448^2 + 23555^2 .

It is a cyclic number.

It is not a de Polignac number, because 3971006729 - 2⁴ = 3971006713 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 3971006729.

It is not an unprimeable number, because it can be changed into a prime (3971006723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1238564 + ... + 1241765.

It is an arithmetic number, because the mean of its divisors is an integer number (993372165).

Almost surely, 2^3971006729 is an apocalyptic number.

It is an amenable number.

3971006729 is a deficient number, since it is larger than the sum of its proper divisors (2481931).

3971006729 is a wasteful number, since it uses less digits than its factorization.

3971006729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2481930.

The product of its (nonzero) digits is 142884, while the sum is 44.

The square root of 3971006729 is about 63015.9244080415. The cubic root of 3971006729 is about 1583.5564188369.

The spelling of 3971006729 in words is "three billion, nine hundred seventy-one million, six thousand, seven hundred twenty-nine".