42145 has 4 divisors (see below), whose sum is σ = 50580. Its totient is φ = 33712.

The previous prime is 42139. The next prime is 42157. The reversal of 42145 is 54124.

42145 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10816 + 31329 = 104^2 + 177^2 .

It is a cyclic number.

It is not a de Polignac number, because 42145 - 2⁷ = 42017 is a prime.

42145 is strictly pandigital in base 6.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4210 + ... + 4219.

It is an arithmetic number, because the mean of its divisors is an integer number (12645).

2⁴²¹⁴⁵ is an apocalyptic number.

It is an amenable number.

42145 is a deficient number, since it is larger than the sum of its proper divisors (8435).

42145 is an equidigital number, since it uses as much as digits as its factorization.

42145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8434.

The product of its digits is 160, while the sum is 16.

The square root of 42145 is about 205.2924742897. The cubic root of 42145 is about 34.8002223970.

Adding to 42145 its reverse (54124), we get a palindrome (96269).

The spelling of 42145 in words is "forty-two thousand, one hundred forty-five".