128449 has 2 divisors, whose sum is σ = 128450. Its totient is φ = 128448.

The previous prime is 128437. The next prime is 128461. The reversal of 128449 is 944821.

It is a balanced prime because it is at equal distance from previous prime (128437) and next prime (128461).

It can be written as a sum of positive squares in only one way, i.e., 110224 + 18225 = 332^2 + 135^2 .

It is an emirp because it is prime and its reverse (944821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128449 - 2⁷ = 128321 is a prime.

It is not a weakly prime, because it can be changed into another prime (128489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64224 + 64225.

It is an arithmetic number, because the mean of its divisors is an integer number (64225).

2¹²⁸⁴⁴⁹ is an apocalyptic number.

It is an amenable number.

128449 is a deficient number, since it is larger than the sum of its proper divisors (1).

128449 is an equidigital number, since it uses as much as digits as its factorization.

128449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2304, while the sum is 28.

The square root of 128449 is about 358.3978236541. The cubic root of 128449 is about 50.4557007849.

The spelling of 128449 in words is "one hundred twenty-eight thousand, four hundred forty-nine".