128743 has 4 divisors (see below), whose sum is σ = 132928. Its totient is φ = 124560.

The previous prime is 128717. The next prime is 128747. The reversal of 128743 is 347821.

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 128743 - 2¹³ = 120551 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2046 + ... + 2107.

It is an arithmetic number, because the mean of its divisors is an integer number (33232).

2¹²⁸⁷⁴³ is an apocalyptic number.

128743 is a deficient number, since it is larger than the sum of its proper divisors (4185).

128743 is an equidigital number, since it uses as much as digits as its factorization.

128743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4184.

The product of its digits is 1344, while the sum is 25.

The square root of 128743 is about 358.8077479654. The cubic root of 128743 is about 50.4941665647.

The spelling of 128743 in words is "one hundred twenty-eight thousand, seven hundred forty-three".