42605 has 4 divisors (see below), whose sum is σ = 51132. Its totient is φ = 34080.

The previous prime is 42589. The next prime is 42611. The reversal of 42605 is 50624.

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 17956 + 24649 = 134^2 + 157^2 .

It is not a de Polignac number, because 42605 - 2^{4} = 42589 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a nialpdrome in 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 42605.

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, 4256 + ... + 4265.

It is an arithmetic number, because the mean of its divisors is an integer number (12783).

2^{42605} is an apocalyptic number.

It is an amenable number.

42605 is a deficient number, since it is larger than the sum of its proper divisors (8527).

42605 is an equidigital number, since it uses as much as digits as its factorization.

42605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8526.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 42605 is about 206.4097865897. The cubic root of 42605 is about 34.9263758490.

The spelling of 42605 in words is "forty-two thousand, six hundred five".

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