217438 has 8 divisors (see below), whose sum is σ = 351288. Its totient is φ = 100344.

The previous prime is 217429. The next prime is 217439. The reversal of 217438 is 834712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217439) by changing a digit.

217438 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4156 + ... + 4207.

It is an arithmetic number, because the mean of its divisors is an integer number (43911).

2²¹⁷⁴³⁸ is an apocalyptic number.

217438 is a deficient number, since it is larger than the sum of its proper divisors (133850).

217438 is a wasteful number, since it uses less digits than its factorization.

217438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8378.

The product of its digits is 1344, while the sum is 25.

The square root of 217438 is about 466.3024769396. The cubic root of 217438 is about 60.1328537623.

The spelling of 217438 in words is "two hundred seventeen thousand, four hundred thirty-eight".