42542609 has 8 divisors (see below), whose sum is σ = 43620192. Its totient is φ = 41469120.

The previous prime is 42542573. The next prime is 42542641. The reversal of 42542609 is 90624524.

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

It is a cyclic number.

It is not a de Polignac number, because 42542609 - 2¹² = 42538513 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (42542659) 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, 37322 + ... + 38444.

It is an arithmetic number, because the mean of its divisors is an integer number (5452524).

Almost surely, 2^42542609 is an apocalyptic number.

It is an amenable number.

42542609 is a deficient number, since it is larger than the sum of its proper divisors (1077583).

42542609 is a wasteful number, since it uses less digits than its factorization.

42542609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2047.

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 42542609 is about 6522.4695476483. The cubic root of 42542609 is about 349.0931872677.

It can be divided in two parts, 425 and 42609, that added together give a palindrome (43034).

The spelling of 42542609 in words is "forty-two million, five hundred forty-two thousand, six hundred nine".