128303985 has 8 divisors (see below), whose sum is σ = 205286400. Its totient is φ = 68428784.

The previous prime is 128303977. The next prime is 128303999. The reversal of 128303985 is 589303821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 128303985 - 2³ = 128303977 is a prime.

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, 4276785 + ... + 4276814.

It is an arithmetic number, because the mean of its divisors is an integer number (25660800).

Almost surely, 2^128303985 is an apocalyptic number.

128303985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

128303985 is a deficient number, since it is larger than the sum of its proper divisors (76982415).

128303985 is an equidigital number, since it uses as much as digits as its factorization.

128303985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8553607.

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 128303985 is about 11327.1348981108. The cubic root of 128303985 is about 504.3670598628.

The spelling of 128303985 in words is "one hundred twenty-eight million, three hundred three thousand, nine hundred eighty-five".