128849 has 8 divisors (see below), whose sum is σ = 149760. Its totient is φ = 108576.

The previous prime is 128837. The next prime is 128857. The reversal of 128849 is 948821.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 128849 - 2⁴ = 128833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 437 + ... + 669.

It is an arithmetic number, because the mean of its divisors is an integer number (18720).

2¹²⁸⁸⁴⁹ is an apocalyptic number.

It is an amenable number.

128849 is a deficient number, since it is larger than the sum of its proper divisors (20911).

128849 is an equidigital number, since it uses as much as digits as its factorization.

128849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319.

The product of its digits is 4608, while the sum is 32.

The square root of 128849 is about 358.9554289881. The cubic root of 128849 is about 50.5080208153.

Adding to 128849 its sum of digits (32), we get a square (128881 = 359²).

The spelling of 128849 in words is "one hundred twenty-eight thousand, eight hundred forty-nine".