128398932 has 30 divisors (see below), whose sum is σ = 335661018. Its totient is φ = 42799536.

The previous prime is 128398891. The next prime is 128398969. The reversal of 128398932 is 239893821.

It can be written as a sum of positive squares in only one way, i.e., 125350416 + 3048516 = 11196^2 + 1746^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 197823 + ... + 198470.

Almost surely, 2^128398932 is an apocalyptic number.

128398932 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

128398932 is an abundant number, since it is smaller than the sum of its proper divisors (207262086).

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

128398932 is a wasteful number, since it uses less digits than its factorization.

128398932 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 396309 (or 396298 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 128398932 is about 11331.3252534732. The cubic root of 128398932 is about 504.4914424152.

The spelling of 128398932 in words is "one hundred twenty-eight million, three hundred ninety-eight thousand, nine hundred thirty-two".