128398424 has 72 divisors (see below), whose sum is σ = 307940220. Its totient is φ = 50006880.

The previous prime is 128398421. The next prime is 128398453. The reversal of 128398424 is 424893821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128398421) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 46079 + ... + 48785.

Almost surely, 2^128398424 is an apocalyptic number.

128398424 is a gapful number since it is divisible by the number (14) 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 128398424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (153970110).

128398424 is an abundant number, since it is smaller than the sum of its proper divisors (179541796).

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

128398424 is a wasteful number, since it uses less digits than its factorization.

128398424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2749 (or 2727 counting only the distinct ones).

The product of its digits is 110592, while the sum is 41.

The square root of 128398424 is about 11331.3028377146. The cubic root of 128398424 is about 504.4907770878.

The spelling of 128398424 in words is "one hundred twenty-eight million, three hundred ninety-eight thousand, four hundred twenty-four".