42847 has 4 divisors (see below), whose sum is σ = 48976. Its totient is φ = 36720.

The previous prime is 42841. The next prime is 42853. The reversal of 42847 is 74824.

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

It is an interprime number because it is at equal distance from previous prime (42841) and next prime (42853).

It is a cyclic number.

It is not a de Polignac number, because 42847 - 2³ = 42839 is a prime.

It is a Duffinian number.

42847 is a lucky number.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3054 + ... + 3067.

It is an arithmetic number, because the mean of its divisors is an integer number (12244).

2⁴²⁸⁴⁷ is an apocalyptic number.

42847 is a deficient number, since it is larger than the sum of its proper divisors (6129).

42847 is an equidigital number, since it uses as much as digits as its factorization.

42847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6128.

The product of its digits is 1792, while the sum is 25.

The square root of 42847 is about 206.9951690258. The cubic root of 42847 is about 34.9923792932.

The spelling of 42847 in words is "forty-two thousand, eight hundred forty-seven".