47217 has 4 divisors (see below), whose sum is σ = 62960. Its totient is φ = 31476.

The previous prime is 47207. The next prime is 47221. The reversal of 47217 is 71274.

47217 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 47217 - 2¹⁵ = 14449 is a prime.

It is a D-number.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 47193 and 47202.

It is not an unprimeable number, because it can be changed into a prime (47207) 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, 7867 + ... + 7872.

It is an arithmetic number, because the mean of its divisors is an integer number (15740).

2⁴⁷²¹⁷ is an apocalyptic number.

It is an amenable number.

47217 is a deficient number, since it is larger than the sum of its proper divisors (15743).

47217 is a wasteful number, since it uses less digits than its factorization.

47217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15742.

The product of its digits is 392, while the sum is 21.

The square root of 47217 is about 217.2947307230. The cubic root of 47217 is about 36.1437156327.

The spelling of 47217 in words is "forty-seven thousand, two hundred seventeen", and thus it is an iban number.