8947 has 4 divisors (see below), whose sum is σ = 9360. Its totient is φ = 8536.
The previous prime is 8941. The next prime is 8951. The reversal of 8947 is 7498.
It is a semiprime because it is the product of two primes.
It is a cyclic number.
It is not a de Polignac number, because 8947 - 27 = 8819 is a prime.
It is an Ulam number.
It is an alternating number because its digits alternate between even and odd.
It is a Duffinian number.
8947 is a lucky number.
It is not an unprimeable number, because it can be changed into a prime (8941) by changing a digit.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 172 + ... + 217.
It is an arithmetic number, because the mean of its divisors is an integer number (2340).
28947 is an apocalyptic number.
8947 is a deficient number, since it is larger than the sum of its proper divisors (413).
8947 is a wasteful number, since it uses less digits than its factorization.
8947 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 412.
The product of its digits is 2016, while the sum is 28.
The square root of 8947 is about 94.5885828205. The cubic root of 8947 is about 20.7599265419.
It can be divided in two parts, 89 and 47, that added together give a triangular number (136 = T16).
The spelling of 8947 in words is "eight thousand, nine hundred forty-seven".
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