42085009 has 8 divisors (see below), whose sum is σ = 44320320. Its totient is φ = 39883536.

The previous prime is 42085007. The next prime is 42085049. The reversal of 42085009 is 90058024.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 42085009 - 2¹ = 42085007 is a prime.

It is a super-4 number, since 4×42085009⁴ (a number of 32 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42085007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5887 + ... + 10900.

It is an arithmetic number, because the mean of its divisors is an integer number (5540040).

Almost surely, 2^42085009 is an apocalyptic number.

It is an amenable number.

42085009 is a deficient number, since it is larger than the sum of its proper divisors (2235311).

42085009 is a wasteful number, since it uses less digits than its factorization.

42085009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16919.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 42085009 is about 6487.2959698167. The cubic root of 42085009 is about 347.8370251322.

The spelling of 42085009 in words is "forty-two million, eighty-five thousand, nine".