42785 has 8 divisors (see below), whose sum is σ = 52800. Its totient is φ = 33264.

The previous prime is 42773. The next prime is 42787. The reversal of 42785 is 58724.

42785 = 8² + 9² + ... + 50².

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 42785 - 2¹⁰ = 41761 is a prime.

It is a Curzon number.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (42787) 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 7 ways as a sum of consecutive naturals, for example, 116 + ... + 314.

It is an arithmetic number, because the mean of its divisors is an integer number (6600).

2⁴²⁷⁸⁵ is an apocalyptic number.

It is an amenable number.

42785 is a deficient number, since it is larger than the sum of its proper divisors (10015).

42785 is a wasteful number, since it uses less digits than its factorization.

42785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 247.

The product of its digits is 2240, while the sum is 26.

The square root of 42785 is about 206.8453528605. The cubic root of 42785 is about 34.9754930484.

It can be divided in two parts, 427 and 85, that added together give a 9-th power (512 = 2⁹).

The spelling of 42785 in words is "forty-two thousand, seven hundred eighty-five".