128317 has 8 divisors (see below), whose sum is σ = 153216. Its totient is φ = 105072.

The previous prime is 128311. The next prime is 128321. The reversal of 128317 is 713821.

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

It is a cyclic number.

It is not a de Polignac number, because 128317 - 2⁷ = 128189 is a prime.

128317 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128311) 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, 238 + ... + 559.

It is an arithmetic number, because the mean of its divisors is an integer number (19152).

2¹²⁸³¹⁷ is an apocalyptic number.

It is an amenable number.

128317 is a deficient number, since it is larger than the sum of its proper divisors (24899).

128317 is an equidigital number, since it uses as much as digits as its factorization.

128317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 827.

The product of its digits is 336, while the sum is 22.

The square root of 128317 is about 358.2136234149. The cubic root of 128317 is about 50.4384113413.

The spelling of 128317 in words is "one hundred twenty-eight thousand, three hundred seventeen".