42445 has 8 divisors (see below), whose sum is σ = 54936. Its totient is φ = 31296.

The previous prime is 42443. The next prime is 42451. The reversal of 42445 is 54424.

42445 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 9 + 42436 = 3^2 + 206^2 .

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 42445 - 2¹ = 42443 is a prime.

It is a Duffinian number.

42445 is strictly pandigital in base 6.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42443) 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, 262 + ... + 391.

It is an arithmetic number, because the mean of its divisors is an integer number (6867).

2⁴²⁴⁴⁵ is an apocalyptic number.

It is an amenable number.

42445 is a deficient number, since it is larger than the sum of its proper divisors (12491).

42445 is a wasteful number, since it uses less digits than its factorization.

42445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 671.

The product of its digits is 640, while the sum is 19.

The square root of 42445 is about 206.0218435021. The cubic root of 42445 is about 34.8825998434.

Adding to 42445 its reverse (54424), we get a palindrome (96869).

The spelling of 42445 in words is "forty-two thousand, four hundred forty-five".