42134209 has 4 divisors (see below), whose sum is σ = 45375316. Its totient is φ = 38893104.

The previous prime is 42134207. The next prime is 42134219. The reversal of 42134209 is 90243124.

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 25553025 + 16581184 = 5055^2 + 4072^2 .

It is a cyclic number.

It is not a de Polignac number, because 42134209 - 2¹ = 42134207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42134207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1620534 + ... + 1620559.

It is an arithmetic number, because the mean of its divisors is an integer number (11343829).

Almost surely, 2^42134209 is an apocalyptic number.

It is an amenable number.

42134209 is a deficient number, since it is larger than the sum of its proper divisors (3241107).

42134209 is a wasteful number, since it uses less digits than its factorization.

42134209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3241106.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 42134209 is about 6491.0868889578. The cubic root of 42134209 is about 347.9725200699.

The spelling of 42134209 in words is "forty-two million, one hundred thirty-four thousand, two hundred nine".