3860765721 has 16 divisors (see below), whose sum is σ = 5772131200. Its totient is φ = 2550228624.

The previous prime is 3860765719. The next prime is 3860765747. The reversal of 3860765721 is 1275670683.

3860765721 is a `hidden beast` number, since 3 + 8 + 6 + 0 + 76 + 572 + 1 = 666.

3860765721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 3860765721 - 2¹ = 3860765719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3860760721) 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, 652981 + ... + 658866.

It is an arithmetic number, because the mean of its divisors is an integer number (360758200).

Almost surely, 2^3860765721 is an apocalyptic number.

It is an amenable number.

3860765721 is a deficient number, since it is larger than the sum of its proper divisors (1911365479).

3860765721 is a wasteful number, since it uses less digits than its factorization.

3860765721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1311965 (or 1311959 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 45.

The square root of 3860765721 is about 62135.0603202411. The cubic root of 3860765721 is about 1568.7647282396.

The spelling of 3860765721 in words is "three billion, eight hundred sixty million, seven hundred sixty-five thousand, seven hundred twenty-one".