Search a number
-
+
47218 = 223609
BaseRepresentation
bin1011100001110010
32101202211
423201302
53002333
61002334
7254443
oct134162
971684
1047218
1132526
12233aa
1318652
14132ca
15decd
hexb872

47218 has 4 divisors (see below), whose sum is σ = 70830. Its totient is φ = 23608.

The previous prime is 47207. The next prime is 47221. The reversal of 47218 is 81274.

47218 is digitally balanced in base 2, because in such base 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 an emirpimes, since its reverse is a distinct semiprime: 81274 = 240637.

It can be written as a sum of positive squares in only one way, i.e., 45369 + 1849 = 213^2 + 43^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

It is an alternating number because its digits alternate between even and odd.

It is a plaindrome in base 12.

It is a nialpdrome in base 16.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11803 + ... + 11806.

247218 is an apocalyptic number.

47218 is a deficient number, since it is larger than the sum of its proper divisors (23612).

47218 is a wasteful number, since it uses less digits than its factorization.

47218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23611.

The product of its digits is 448, while the sum is 22.

The square root of 47218 is about 217.2970317331. The cubic root of 47218 is about 36.1439707912.

The spelling of 47218 in words is "forty-seven thousand, two hundred eighteen".

Divisors: 1 2 23609 47218