128140 has 24 divisors (see below), whose sum is σ = 277200. Its totient is φ = 49728.

The previous prime is 128119. The next prime is 128147. The reversal of 128140 is 41821.

It is a happy number.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (128147) 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, 786 + ... + 934.

It is an arithmetic number, because the mean of its divisors is an integer number (11550).

2¹²⁸¹⁴⁰ is an apocalyptic number.

128140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (138600).

128140 is an abundant number, since it is smaller than the sum of its proper divisors (149060).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

128140 is a wasteful number, since it uses less digits than its factorization.

128140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201 (or 199 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 128140 is about 357.9664788776. The cubic root of 128140 is about 50.4152091497.

Adding to 128140 its reverse (41821), we get a palindrome (169961).

The spelling of 128140 in words is "one hundred twenty-eight thousand, one hundred forty".