40847 has 2 divisors, whose sum is σ = 40848. Its totient is φ = 40846.

The previous prime is 40841. The next prime is 40849. The reversal of 40847 is 74804.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40847 - 2⁸ = 40591 is a prime.

Together with 40849, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40841) 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 as a sum of consecutive naturals, namely, 20423 + 20424.

It is an arithmetic number, because the mean of its divisors is an integer number (20424).

2⁴⁰⁸⁴⁷ is an apocalyptic number.

40847 is a deficient number, since it is larger than the sum of its proper divisors (1).

40847 is an equidigital number, since it uses as much as digits as its factorization.

40847 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 896, while the sum is 23.

The square root of 40847 is about 202.1064076174. The cubic root of 40847 is about 34.4392264805.

The spelling of 40847 in words is "forty thousand, eight hundred forty-seven".