42545 has 8 divisors (see below), whose sum is σ = 52224. Its totient is φ = 33264.

The previous prime is 42533. The next prime is 42557. The reversal of 42545 is 54524.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (42533) and next prime (42557).

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 42545 - 2¹⁰ = 41521 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a nialpdrome in base 9 and base 16.

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 7 ways as a sum of consecutive naturals, for example, 272 + ... + 398.

It is an arithmetic number, because the mean of its divisors is an integer number (6528).

2⁴²⁵⁴⁵ is an apocalyptic number.

It is an amenable number.

42545 is a deficient number, since it is larger than the sum of its proper divisors (9679).

42545 is a wasteful number, since it uses less digits than its factorization.

42545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199.

The product of its digits is 800, while the sum is 20.

The square root of 42545 is about 206.2643934372. The cubic root of 42545 is about 34.9099727112.

The spelling of 42545 in words is "forty-two thousand, five hundred forty-five".