128338849 has 2 divisors, whose sum is σ = 128338850. Its totient is φ = 128338848.

The previous prime is 128338843. The next prime is 128338877. The reversal of 128338849 is 948833821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 127803025 + 535824 = 11305^2 + 732^2 .

It is a cyclic number.

It is not a de Polignac number, because 128338849 - 2³ = 128338841 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 128338799 and 128338808.

It is not a weakly prime, because it can be changed into another prime (128338841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64169424 + 64169425.

It is an arithmetic number, because the mean of its divisors is an integer number (64169425).

Almost surely, 2^128338849 is an apocalyptic number.

It is an amenable number.

128338849 is a deficient number, since it is larger than the sum of its proper divisors (1).

128338849 is an equidigital number, since it uses as much as digits as its factorization.

128338849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 331776, while the sum is 46.

The square root of 128338849 is about 11328.6737529157. The cubic root of 128338849 is about 504.4127395578.

The spelling of 128338849 in words is "one hundred twenty-eight million, three hundred thirty-eight thousand, eight hundred forty-nine".