128943047 has 4 divisors (see below), whose sum is σ = 128972496. Its totient is φ = 128913600.

The previous prime is 128942999. The next prime is 128943049. The reversal of 128943047 is 740349821.

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 128943047 - 2⁸ = 128942791 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 128943047.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128943049) 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, 6698 + ... + 17399.

It is an arithmetic number, because the mean of its divisors is an integer number (32243124).

Almost surely, 2^128943047 is an apocalyptic number.

128943047 is a deficient number, since it is larger than the sum of its proper divisors (29449).

128943047 is an equidigital number, since it uses as much as digits as its factorization.

128943047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29448.

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 128943047 is about 11355.3091987845. The cubic root of 128943047 is about 505.2030644321.

The spelling of 128943047 in words is "one hundred twenty-eight million, nine hundred forty-three thousand, forty-seven".