42245 has 16 divisors (see below), whose sum is σ = 62208. Its totient is φ = 26880.

The previous prime is 42239. The next prime is 42257. The reversal of 42245 is 54224.

42245 is nontrivially palindromic in base 6.

It is not a de Polignac number, because 42245 - 2⁶ = 42181 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a d-powerful number, because it can be written as 4⁴ + 2¹³ + 2¹⁵ + 4⁵ + 5 .

It is a Duffinian number.

It is a plaindrome in base 14.

It is a zygodrome in base 4.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 560 + ... + 630.

It is an arithmetic number, because the mean of its divisors is an integer number (3888).

2⁴²²⁴⁵ is an apocalyptic number.

42245 is the 119-th octagonal number.

It is an amenable number.

42245 is a deficient number, since it is larger than the sum of its proper divisors (19963).

42245 is a wasteful number, since it uses less digits than its factorization.

42245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100.

The product of its digits is 320, while the sum is 17.

The square root of 42245 is about 205.5358849447. The cubic root of 42245 is about 34.8277248563.

42245 divided by its sum of digits (17) gives a triangular number (2485 = T₇₀).

Adding to 42245 its reverse (54224), we get a palindrome (96469).

The spelling of 42245 in words is "forty-two thousand, two hundred forty-five".