128403403 has 4 divisors (see below), whose sum is σ = 128784760. Its totient is φ = 128022048.

The previous prime is 128403383. The next prime is 128403419. The reversal of 128403403 is 304304821.

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 128403403 - 2⁵ = 128403371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128403493) 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, 190173 + ... + 190846.

It is an arithmetic number, because the mean of its divisors is an integer number (32196190).

Almost surely, 2^128403403 is an apocalyptic number.

128403403 is a deficient number, since it is larger than the sum of its proper divisors (381357).

128403403 is an equidigital number, since it uses as much as digits as its factorization.

128403403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381356.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 128403403 is about 11331.5225367115. The cubic root of 128403403 is about 504.4972980067.

The spelling of 128403403 in words is "one hundred twenty-eight million, four hundred three thousand, four hundred three".