128945 has 16 divisors (see below), whose sum is σ = 172368. Its totient is φ = 92160.

The previous prime is 128941. The next prime is 128951. The reversal of 128945 is 549821.

It can be written as a sum of positive squares in 8 ways, for example, as 64 + 128881 = 8^2 + 359^2 .

It is not a de Polignac number, because 128945 - 2² = 128941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128941) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3125 + ... + 3165.

It is an arithmetic number, because the mean of its divisors is an integer number (10773).

128945 is a Friedman number, since it can be written as 21^4-(9-5)^8, using all its digits and the basic arithmetic operations.

2¹²⁸⁹⁴⁵ is an apocalyptic number.

It is an amenable number.

128945 is a deficient number, since it is larger than the sum of its proper divisors (43423).

128945 is a wasteful number, since it uses less digits than its factorization.

128945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100.

The product of its digits is 2880, while the sum is 29.

The square root of 128945 is about 359.0891254271. The cubic root of 128945 is about 50.5205615058.

The spelling of 128945 in words is "one hundred twenty-eight thousand, nine hundred forty-five".