128424 has 16 divisors (see below), whose sum is σ = 321120. Its totient is φ = 42800.

The previous prime is 128413. The next prime is 128431. The reversal of 128424 is 424821.

It is a nude number because it is divisible by every one of its digits.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 128424.

It is an unprimeable number.

128424 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2652 + ... + 2699.

It is an arithmetic number, because the mean of its divisors is an integer number (20070).

2¹²⁸⁴²⁴ is an apocalyptic number.

It is an amenable number.

128424 is an abundant number, since it is smaller than the sum of its proper divisors (192696).

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

128424 is a wasteful number, since it uses less digits than its factorization.

128424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5360 (or 5356 counting only the distinct ones).

The product of its digits is 512, while the sum is 21.

The square root of 128424 is about 358.3629445130. The cubic root of 128424 is about 50.4524271786.

The spelling of 128424 in words is "one hundred twenty-eight thousand, four hundred twenty-four".