128432440 has 32 divisors (see below), whose sum is σ = 289320480. Its totient is φ = 51311232.

The previous prime is 128432417. The next prime is 128432441. The reversal of 128432440 is 44234821.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 128432399 and 128432408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128432441) 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, 47197 + ... + 49843.

It is an arithmetic number, because the mean of its divisors is an integer number (9041265).

Almost surely, 2^128432440 is an apocalyptic number.

128432440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128432440 is an abundant number, since it is smaller than the sum of its proper divisors (160888040).

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

128432440 is a wasteful number, since it uses less digits than its factorization.

128432440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3871 (or 3867 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 28.

The square root of 128432440 is about 11332.8037131153. The cubic root of 128432440 is about 504.5353239561.

The spelling of 128432440 in words is "one hundred twenty-eight million, four hundred thirty-two thousand, four hundred forty".