128169 has 16 divisors (see below), whose sum is σ = 195840. Its totient is φ = 82800.

The previous prime is 128159. The next prime is 128173. The reversal of 128169 is 961821.

It is not a de Polignac number, because 128169 - 2⁴ = 128153 is a prime.

It is a super-2 number, since 2×128169² = 32854585122, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (128119) 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, 1219 + ... + 1319.

It is an arithmetic number, because the mean of its divisors is an integer number (12240).

2¹²⁸¹⁶⁹ is an apocalyptic number.

It is an amenable number.

128169 is a deficient number, since it is larger than the sum of its proper divisors (67671).

128169 is a wasteful number, since it uses less digits than its factorization.

128169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157 (or 151 counting only the distinct ones).

The product of its digits is 864, while the sum is 27.

The square root of 128169 is about 358.0069831721. The cubic root of 128169 is about 50.4190121016.

The spelling of 128169 in words is "one hundred twenty-eight thousand, one hundred sixty-nine".