128907940 has 48 divisors (see below), whose sum is σ = 327583872. Its totient is φ = 41596416.

The previous prime is 128907931. The next prime is 128907941. The reversal of 128907940 is 49709821.

It is a junction number, because it is equal to n+sod(n) for n = 128907893 and 128907902.

It is not an unprimeable number, because it can be changed into a prime (128907941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24702 + ... + 29461.

It is an arithmetic number, because the mean of its divisors is an integer number (6824664).

Almost surely, 2^128907940 is an apocalyptic number.

128907940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128907940 is an abundant number, since it is smaller than the sum of its proper divisors (198675932).

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

128907940 is a wasteful number, since it uses less digits than its factorization.

128907940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54196 (or 54194 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 128907940 is about 11353.7632527722. The cubic root of 128907940 is about 505.1572101465.

The spelling of 128907940 in words is "one hundred twenty-eight million, nine hundred seven thousand, nine hundred forty".