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42565 = 58513
BaseRepresentation
bin1010011001000101
32011101111
422121011
52330230
6525021
7235045
oct123105
964344
1042565
1129a86
1220771
13164b3
1411725
15c92a
hexa645

42565 has 4 divisors (see below), whose sum is σ = 51084. Its totient is φ = 34048.

The previous prime is 42557. The next prime is 42569. The reversal of 42565 is 56524.

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 31329 + 11236 = 177^2 + 106^2 .

It is a cyclic number.

It is not a de Polignac number, because 42565 - 23 = 42557 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42569) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 4252 + ... + 4261.

It is an arithmetic number, because the mean of its divisors is an integer number (12771).

242565 is an apocalyptic number.

It is an amenable number.

42565 is a deficient number, since it is larger than the sum of its proper divisors (8519).

42565 is an equidigital number, since it uses as much as digits as its factorization.

42565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8518.

The product of its digits is 1200, while the sum is 22.

The square root of 42565 is about 206.3128692060. The cubic root of 42565 is about 34.9154421364.

The spelling of 42565 in words is "forty-two thousand, five hundred sixty-five".

Divisors: 1 5 8513 42565