128386945 has 4 divisors (see below), whose sum is σ = 154064340. Its totient is φ = 102709552.

The previous prime is 128386931. The next prime is 128386981. The reversal of 128386945 is 549683821.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 58614336 + 69772609 = 7656^2 + 8353^2 .

It is a cyclic number.

It is not a de Polignac number, because 128386945 - 2⁵ = 128386913 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 128386895 and 128386904.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12838690 + ... + 12838699.

It is an arithmetic number, because the mean of its divisors is an integer number (38516085).

Almost surely, 2^128386945 is an apocalyptic number.

It is an amenable number.

128386945 is a deficient number, since it is larger than the sum of its proper divisors (25677395).

128386945 is an equidigital number, since it uses as much as digits as its factorization.

128386945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25677394.

The product of its digits is 414720, while the sum is 46.

The square root of 128386945 is about 11330.7963091744. The cubic root of 128386945 is about 504.4757425777.

The spelling of 128386945 in words is "one hundred twenty-eight million, three hundred eighty-six thousand, nine hundred forty-five".