42147905 has 4 divisors (see below), whose sum is σ = 50577492. Its totient is φ = 33718320.

The previous prime is 42147893. The next prime is 42147929. The reversal of 42147905 is 50974124.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18421264 + 23726641 = 4292^2 + 4871^2 .

It is not a de Polignac number, because 42147905 - 2¹⁴ = 42131521 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4214786 + ... + 4214795.

It is an arithmetic number, because the mean of its divisors is an integer number (12644373).

Almost surely, 2^42147905 is an apocalyptic number.

It is an amenable number.

42147905 is a deficient number, since it is larger than the sum of its proper divisors (8429587).

42147905 is an equidigital number, since it uses as much as digits as its factorization.

42147905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8429586.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 42147905 is about 6492.1417883469. The cubic root of 42147905 is about 348.0102195660.

The spelling of 42147905 in words is "forty-two million, one hundred forty-seven thousand, nine hundred five".