128215933 has 4 divisors (see below), whose sum is σ = 134964160. Its totient is φ = 121467708.

The previous prime is 128215903. The next prime is 128215943. The reversal of 128215933 is 339512821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128215933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128215903) 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 3 ways as a sum of consecutive naturals, for example, 3374085 + ... + 3374122.

It is an arithmetic number, because the mean of its divisors is an integer number (33741040).

Almost surely, 2^128215933 is an apocalyptic number.

It is an amenable number.

128215933 is a deficient number, since it is larger than the sum of its proper divisors (6748227).

128215933 is an equidigital number, since it uses as much as digits as its factorization.

128215933 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6748226.

The product of its digits is 12960, while the sum is 34.

The square root of 128215933 is about 11323.2474582162. The cubic root of 128215933 is about 504.2516550515.

The spelling of 128215933 in words is "one hundred twenty-eight million, two hundred fifteen thousand, nine hundred thirty-three".