128049 has 4 divisors (see below), whose sum is σ = 170736. Its totient is φ = 85364.

The previous prime is 128047. The next prime is 128053. The reversal of 128049 is 940821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 128049 - 2¹ = 128047 is a prime.

It is a D-number.

128049 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (128047) 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, 21339 + ... + 21344.

It is an arithmetic number, because the mean of its divisors is an integer number (42684).

2¹²⁸⁰⁴⁹ is an apocalyptic number.

It is an amenable number.

128049 is a deficient number, since it is larger than the sum of its proper divisors (42687).

128049 is an equidigital number, since it uses as much as digits as its factorization.

128049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42686.

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 128049 is about 357.8393494293. The cubic root of 128049 is about 50.4032720224.

The spelling of 128049 in words is "one hundred twenty-eight thousand, forty-nine".