128215389 has 8 divisors (see below), whose sum is σ = 174591360. Its totient is φ = 83658176.

The previous prime is 128215369. The next prime is 128215391. The reversal of 128215389 is 983512821.

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 128215389 - 2⁷ = 128215261 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128215369) 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, 454524 + ... + 454805.

It is an arithmetic number, because the mean of its divisors is an integer number (21823920).

Almost surely, 2^128215389 is an apocalyptic number.

It is an amenable number.

128215389 is a deficient number, since it is larger than the sum of its proper divisors (46375971).

128215389 is an equidigital number, since it uses as much as digits as its factorization.

128215389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 909379.

The product of its digits is 34560, while the sum is 39.

The square root of 128215389 is about 11323.2234368134. The cubic root of 128215389 is about 504.2509418971.

The spelling of 128215389 in words is "one hundred twenty-eight million, two hundred fifteen thousand, three hundred eighty-nine".