42005971 has 4 divisors (see below), whose sum is σ = 48006832. Its totient is φ = 36005112.

The previous prime is 42005933. The next prime is 42005983. The reversal of 42005971 is 17950024.

It is a happy number.

42005971 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.

It is a cyclic number.

It is not a de Polignac number, because 42005971 - 2⁹ = 42005459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42005071) 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, 3000420 + ... + 3000433.

It is an arithmetic number, because the mean of its divisors is an integer number (12001708).

Almost surely, 2^42005971 is an apocalyptic number.

42005971 is a deficient number, since it is larger than the sum of its proper divisors (6000861).

42005971 is an equidigital number, since it uses as much as digits as its factorization.

42005971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6000860.

The product of its (nonzero) digits is 2520, while the sum is 28.

The square root of 42005971 is about 6481.2013546873. The cubic root of 42005971 is about 347.6191362121.

Adding to 42005971 its reverse (17950024), we get a palindrome (59955995).

The spelling of 42005971 in words is "forty-two million, five thousand, nine hundred seventy-one".