42645 has 8 divisors (see below), whose sum is σ = 68256. Its totient is φ = 22736.

The previous prime is 42643. The next prime is 42649. The reversal of 42645 is 54624.

It is a happy number.

42645 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 42645 - 2¹ = 42643 is a prime.

It is a nialpdrome in base 9 and base 15.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 42645.

It is not an unprimeable number, because it can be changed into a prime (42641) 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, 1407 + ... + 1436.

It is an arithmetic number, because the mean of its divisors is an integer number (8532).

2⁴²⁶⁴⁵ is an apocalyptic number.

It is an amenable number.

42645 is a deficient number, since it is larger than the sum of its proper divisors (25611).

42645 is a wasteful number, since it uses less digits than its factorization.

42645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2851.

The product of its digits is 960, while the sum is 21.

The square root of 42645 is about 206.5066584883. The cubic root of 42645 is about 34.9373027202.

Subtracting from 42645 its sum of digits (21), we obtain a palindrome (42624).

The spelling of 42645 in words is "forty-two thousand, six hundred forty-five".