47817 has 32 divisors (see below), whose sum is σ = 92160. Its totient is φ = 23760.

The previous prime is 47809. The next prime is 47819. The reversal of 47817 is 71874.

It is not a de Polignac number, because 47817 - 2³ = 47809 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (47819) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2068 + ... + 2090.

It is an arithmetic number, because the mean of its divisors is an integer number (2880).

2⁴⁷⁸¹⁷ is an apocalyptic number.

It is an amenable number.

47817 is a deficient number, since it is larger than the sum of its proper divisors (44343).

47817 is a wasteful number, since it uses less digits than its factorization.

47817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50 (or 44 counting only the distinct ones).

The product of its digits is 1568, while the sum is 27.

The square root of 47817 is about 218.6709857297. The cubic root of 47817 is about 36.2961678900.

47817 divided by its sum of digits (27) gives a palindrome (1771).

The spelling of 47817 in words is "forty-seven thousand, eight hundred seventeen".