3861440729 has 2 divisors, whose sum is σ = 3861440730. Its totient is φ = 3861440728.

The previous prime is 3861440659. The next prime is 3861440743. The reversal of 3861440729 is 9270441683.

3861440729 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3658435225 + 203005504 = 60485^2 + 14248^2 .

It is a cyclic number.

It is not a de Polignac number, because 3861440729 - 2²⁰ = 3860392153 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3861440729.

It is not a weakly prime, because it can be changed into another prime (3861440749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1930720364 + 1930720365.

It is an arithmetic number, because the mean of its divisors is an integer number (1930720365).

Almost surely, 2^3861440729 is an apocalyptic number.

It is an amenable number.

3861440729 is a deficient number, since it is larger than the sum of its proper divisors (1).

3861440729 is an equidigital number, since it uses as much as digits as its factorization.

3861440729 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 290304, while the sum is 44.

The square root of 3861440729 is about 62140.4918631966. The cubic root of 3861440729 is about 1568.8561493989.

The spelling of 3861440729 in words is "three billion, eight hundred sixty-one million, four hundred forty thousand, seven hundred twenty-nine".