128509384 has 32 divisors (see below), whose sum is σ = 250122240. Its totient is φ = 61833600.

The previous prime is 128509373. The next prime is 128509397. The reversal of 128509384 is 483905821.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46012 + ... + 48724.

It is an arithmetic number, because the mean of its divisors is an integer number (7816320).

Almost surely, 2^128509384 is an apocalyptic number.

It is an amenable number.

128509384 is a deficient number, since it is larger than the sum of its proper divisors (121612856).

128509384 is a wasteful number, since it uses less digits than its factorization.

128509384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2941 (or 2937 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 40.

The square root of 128509384 is about 11336.1979516944. The cubic root of 128509384 is about 504.6360597100.

The spelling of 128509384 in words is "one hundred twenty-eight million, five hundred nine thousand, three hundred eighty-four".