42108317 has 4 divisors (see below), whose sum is σ = 42128700. Its totient is φ = 42087936.

The previous prime is 42108301. The next prime is 42108347. The reversal of 42108317 is 71380124.

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 26275876 + 15832441 = 5126^2 + 3979^2 .

It is a cyclic number.

It is not a de Polignac number, because 42108317 - 2⁴ = 42108301 is a prime.

It is a super-2 number, since 2×42108317² = 3546220721144978, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42108347) 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, 6692 + ... + 11357.

It is an arithmetic number, because the mean of its divisors is an integer number (10532175).

Almost surely, 2^42108317 is an apocalyptic number.

It is an amenable number.

42108317 is a deficient number, since it is larger than the sum of its proper divisors (20383).

42108317 is a wasteful number, since it uses less digits than its factorization.

42108317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20382.

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 42108317 is about 6489.0921553018. The cubic root of 42108317 is about 347.9012276383.

The spelling of 42108317 in words is "forty-two million, one hundred eight thousand, three hundred seventeen".