217938 has 16 divisors (see below), whose sum is σ = 498240. Its totient is φ = 62256.

The previous prime is 217937. The next prime is 217969. The reversal of 217938 is 839712.

It is a happy number.

217938 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 217938.

It is not an unprimeable number, because it can be changed into a prime (217933) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2553 + ... + 2636.

It is an arithmetic number, because the mean of its divisors is an integer number (31140).

2²¹⁷⁹³⁸ is an apocalyptic number.

217938 is an abundant number, since it is smaller than the sum of its proper divisors (280302).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

217938 is a wasteful number, since it uses less digits than its factorization.

217938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5201.

The product of its digits is 3024, while the sum is 30.

The square root of 217938 is about 466.8383017705. The cubic root of 217938 is about 60.1789104318.

The spelling of 217938 in words is "two hundred seventeen thousand, nine hundred thirty-eight".