128103989 has 4 divisors (see below), whose sum is σ = 137958156. Its totient is φ = 118249824.

The previous prime is 128103973. The next prime is 128104003. The reversal of 128103989 is 989301821.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 70980625 + 57123364 = 8425^2 + 7558^2 .

It is a cyclic number.

It is not a de Polignac number, because 128103989 - 2⁴ = 128103973 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 (128103389) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4927064 + ... + 4927089.

It is an arithmetic number, because the mean of its divisors is an integer number (34489539).

Almost surely, 2^128103989 is an apocalyptic number.

It is an amenable number.

128103989 is a deficient number, since it is larger than the sum of its proper divisors (9854167).

128103989 is an equidigital number, since it uses as much as digits as its factorization.

128103989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9854166.

The product of its (nonzero) digits is 31104, while the sum is 41.

The square root of 128103989 is about 11318.3032739011. The cubic root of 128103989 is about 504.1048600265.

The spelling of 128103989 in words is "one hundred twenty-eight million, one hundred three thousand, nine hundred eighty-nine".