128245 has 8 divisors (see below), whose sum is σ = 165816. Its totient is φ = 94656.

The previous prime is 128239. The next prime is 128257. The reversal of 128245 is 542821.

It can be written as a sum of positive squares in 4 ways, for example, as 81 + 128164 = 9^2 + 358^2 .

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 128245 - 2³ = 128237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 922 + ... + 1051.

It is an arithmetic number, because the mean of its divisors is an integer number (20727).

2¹²⁸²⁴⁵ is an apocalyptic number.

It is an amenable number.

128245 is a deficient number, since it is larger than the sum of its proper divisors (37571).

128245 is a wasteful number, since it uses less digits than its factorization.

128245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1991.

The product of its digits is 640, while the sum is 22.

The square root of 128245 is about 358.1131106229. The cubic root of 128245 is about 50.4289757376.

It can be divided in two parts, 128 and 245, that added together give a palindrome (373).

The spelling of 128245 in words is "one hundred twenty-eight thousand, two hundred forty-five".