217430 has 16 divisors (see below), whose sum is σ = 414720. Its totient is φ = 81792.

The previous prime is 217429. The next prime is 217439. The reversal of 217430 is 34712.

It is a happy number.

217430 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a junction number, because it is equal to n+sod(n) for n = 217399 and 217408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217439) 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, 470 + ... + 809.

It is an arithmetic number, because the mean of its divisors is an integer number (25920).

2²¹⁷⁴³⁰ is an apocalyptic number.

217430 is a deficient number, since it is larger than the sum of its proper divisors (197290).

217430 is a wasteful number, since it uses less digits than its factorization.

217430 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1303.

The product of its (nonzero) digits is 168, while the sum is 17.

The square root of 217430 is about 466.2938987377. The cubic root of 217430 is about 60.1321162820.

The spelling of 217430 in words is "two hundred seventeen thousand, four hundred thirty".