128940 has 48 divisors (see below), whose sum is σ = 413952. Its totient is φ = 29376.

The previous prime is 128939. The next prime is 128941. The reversal of 128940 is 49821.

It is an interprime number because it is at equal distance from previous prime (128939) and next prime (128941).

It is a self number, because there is not a number n which added to its sum of digits gives 128940.

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, 267 + ... + 573.

It is an arithmetic number, because the mean of its divisors is an integer number (8624).

2¹²⁸⁹⁴⁰ is an apocalyptic number.

128940 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 128940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (206976).

128940 is an abundant number, since it is smaller than the sum of its proper divisors (285012).

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

128940 is a wasteful number, since it uses less digits than its factorization.

128940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326 (or 324 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 128940 is about 359.0821632997. The cubic root of 128940 is about 50.5199084986.

The spelling of 128940 in words is "one hundred twenty-eight thousand, nine hundred forty".