47857 has 2 divisors, whose sum is σ = 47858. Its totient is φ = 47856.
The previous prime is 47843. The next prime is 47869. The reversal of 47857 is 75874.
It is a happy number.
It is a strong prime.
It can be written as a sum of positive squares in only one way, i.e., 41616 + 6241 = 204^2 + 79^2 .
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-47857 is a prime.
It is not a weakly prime, because it can be changed into another prime (47807) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23928 + 23929.
It is an arithmetic number, because the mean of its divisors is an integer number (23929).
247857 is an apocalyptic number.
It is an amenable number.
47857 is a deficient number, since it is larger than the sum of its proper divisors (1).
47857 is an equidigital number, since it uses as much as digits as its factorization.
47857 is an evil number, because the sum of its binary digits is even.
The product of its digits is 7840, while the sum is 31.
The square root of 47857 is about 218.7624282184. The cubic root of 47857 is about 36.3062859238.
It can be divided in two parts, 478 and 57, that added together give a palindrome (535).
The spelling of 47857 in words is "forty-seven thousand, eight hundred fifty-seven".
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