128438107 has 4 divisors (see below), whose sum is σ = 146786416. Its totient is φ = 110089800.

The previous prime is 128438099. The next prime is 128438113. The reversal of 128438107 is 701834821.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 701834821 = 4909 ⋅142969.

It is a cyclic number.

It is not a de Polignac number, because 128438107 - 2³ = 128438099 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128438147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9174144 + ... + 9174157.

It is an arithmetic number, because the mean of its divisors is an integer number (36696604).

Almost surely, 2^128438107 is an apocalyptic number.

128438107 is a deficient number, since it is larger than the sum of its proper divisors (18348309).

128438107 is an equidigital number, since it uses as much as digits as its factorization.

128438107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18348308.

The product of its (nonzero) digits is 10752, while the sum is 34.

The square root of 128438107 is about 11333.0537367472. The cubic root of 128438107 is about 504.5427446141.

The spelling of 128438107 in words is "one hundred twenty-eight million, four hundred thirty-eight thousand, one hundred seven".