42647 has 4 divisors (see below), whose sum is σ = 46536. Its totient is φ = 38760.
The previous prime is 42643. The next prime is 42649. The reversal of 42647 is 74624.
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 42647 - 22 = 42643 is a prime.
It is a Duffinian number.
It is a nialpdrome in base 15.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (42641) 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, 1928 + ... + 1949.
It is an arithmetic number, because the mean of its divisors is an integer number (11634).
242647 is an apocalyptic number.
42647 is a deficient number, since it is larger than the sum of its proper divisors (3889).
42647 is a wasteful number, since it uses less digits than its factorization.
42647 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 3888.
The product of its digits is 1344, while the sum is 23.
The square root of 42647 is about 206.5115008904. The cubic root of 42647 is about 34.9378488844.
Subtracting from 42647 its sum of digits (23), we obtain a palindrome (42624).
The spelling of 42647 in words is "forty-two thousand, six hundred forty-seven".
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