128840243 has 8 divisors (see below), whose sum is σ = 152323680. Its totient is φ = 106626240.

The previous prime is 128840237. The next prime is 128840251. The reversal of 128840243 is 342048821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 128840243 - 2¹⁰ = 128839219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128840213) 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 7 ways as a sum of consecutive naturals, for example, 317138 + ... + 317543.

It is an arithmetic number, because the mean of its divisors is an integer number (19040460).

Almost surely, 2^128840243 is an apocalyptic number.

128840243 is a deficient number, since it is larger than the sum of its proper divisors (23483437).

128840243 is an equidigital number, since it uses as much as digits as its factorization.

128840243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 634717.

The product of its (nonzero) digits is 12288, while the sum is 32.

The square root of 128840243 is about 11350.7816030439. The cubic root of 128840243 is about 505.0687655925.

The spelling of 128840243 in words is "one hundred twenty-eight million, eight hundred forty thousand, two hundred forty-three".