42871729 has 4 divisors (see below), whose sum is σ = 44254720. Its totient is φ = 41488740.

The previous prime is 42871721. The next prime is 42871757. The reversal of 42871729 is 92717824.

42871729 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 42871729 - 2³ = 42871721 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42871691 and 42871700.

It is not an unprimeable number, because it can be changed into a prime (42871721) 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, 691449 + ... + 691510.

It is an arithmetic number, because the mean of its divisors is an integer number (11063680).

Almost surely, 2^42871729 is an apocalyptic number.

It is an amenable number.

42871729 is a deficient number, since it is larger than the sum of its proper divisors (1382991).

42871729 is a wasteful number, since it uses less digits than its factorization.

42871729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1382990.

The product of its digits is 56448, while the sum is 40.

The square root of 42871729 is about 6547.6506473696. The cubic root of 42871729 is about 349.9910990934.

The spelling of 42871729 in words is "forty-two million, eight hundred seventy-one thousand, seven hundred twenty-nine".