128417 has 4 divisors (see below), whose sum is σ = 129156. Its totient is φ = 127680.

The previous prime is 128413. The next prime is 128431. The reversal of 128417 is 714821.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 99856 + 28561 = 316^2 + 169^2 .

It is a cyclic number.

It is not a de Polignac number, because 128417 - 2² = 128413 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 128392 and 128401.

It is not an unprimeable number, because it can be changed into a prime (128411) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53 + ... + 509.

It is an arithmetic number, because the mean of its divisors is an integer number (32289).

2¹²⁸⁴¹⁷ is an apocalyptic number.

It is an amenable number.

128417 is a deficient number, since it is larger than the sum of its proper divisors (739).

128417 is an equidigital number, since it uses as much as digits as its factorization.

128417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 738.

The product of its digits is 448, while the sum is 23.

The square root of 128417 is about 358.3531777451. The cubic root of 128417 is about 50.4515104927.

It can be divided in two parts, 128 and 417, that added together give a palindrome (545).

The spelling of 128417 in words is "one hundred twenty-eight thousand, four hundred seventeen".