3871729 has 4 divisors (see below), whose sum is σ = 3929584. Its totient is φ = 3813876.

The previous prime is 3871691. The next prime is 3871759. The reversal of 3871729 is 9271783.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3871729 - 2⁷ = 3871601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3871759) 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, 28827 + ... + 28960.

It is an arithmetic number, because the mean of its divisors is an integer number (982396).

Almost surely, 2^3871729 is an apocalyptic number.

It is an amenable number.

3871729 is a deficient number, since it is larger than the sum of its proper divisors (57855).

3871729 is an equidigital number, since it uses as much as digits as its factorization.

3871729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57854.

The product of its digits is 21168, while the sum is 37.

The square root of 3871729 is about 1967.6709582651. The cubic root of 3871729 is about 157.0248246680.

It can be divided in two parts, 387 and 1729, that added together give a square (2116 = 46²).

The spelling of 3871729 in words is "three million, eight hundred seventy-one thousand, seven hundred twenty-nine".