128741 has 4 divisors (see below), whose sum is σ = 136332. Its totient is φ = 121152.

The previous prime is 128717. The next prime is 128747. The reversal of 128741 is 147821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 147821 = 23 ⋅6427.

It can be written as a sum of positive squares in 2 ways, for example, as 119716 + 9025 = 346^2 + 95^2 .

It is a cyclic number.

It is not a de Polignac number, because 128741 - 2⁶ = 128677 is a prime.

It is a Duffinian number.

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 polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3770 + ... + 3803.

It is an arithmetic number, because the mean of its divisors is an integer number (34083).

2¹²⁸⁷⁴¹ is an apocalyptic number.

It is an amenable number.

128741 is a deficient number, since it is larger than the sum of its proper divisors (7591).

128741 is an equidigital number, since it uses as much as digits as its factorization.

128741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7590.

The product of its digits is 448, while the sum is 23.

The square root of 128741 is about 358.8049609468. The cubic root of 128741 is about 50.4939050907.

The spelling of 128741 in words is "one hundred twenty-eight thousand, seven hundred forty-one".