128489503 has 4 divisors (see below), whose sum is σ = 128554920. Its totient is φ = 128424088.

The previous prime is 128489483. The next prime is 128489521. The reversal of 128489503 is 305984821.

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

It is a cyclic number.

It is not a de Polignac number, because 128489503 - 2⁹ = 128488991 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128489303) 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, 29668 + ... + 33721.

It is an arithmetic number, because the mean of its divisors is an integer number (32138730).

Almost surely, 2^128489503 is an apocalyptic number.

128489503 is a deficient number, since it is larger than the sum of its proper divisors (65417).

128489503 is an equidigital number, since it uses as much as digits as its factorization.

128489503 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65416.

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

The square root of 128489503 is about 11335.3210364771. The cubic root of 128489503 is about 504.6100351853.

The spelling of 128489503 in words is "one hundred twenty-eight million, four hundred eighty-nine thousand, five hundred three".