9945128 has 8 divisors (see below), whose sum is σ = 18647130. Its totient is φ = 4972560.

The previous prime is 9945121. The next prime is 9945137. The reversal of 9945128 is 8215499.

It can be written as a sum of positive squares in only one way, i.e., 7628644 + 2316484 = 2762^2 + 1522^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 9945091 and 9945100.

It is not an unprimeable number, because it can be changed into a prime (9945121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621563 + ... + 621578.

Almost surely, 2^9945128 is an apocalyptic number.

It is an amenable number.

9945128 is a deficient number, since it is larger than the sum of its proper divisors (8702002).

9945128 is a wasteful number, since it uses less digits than its factorization.

9945128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1243147 (or 1243143 counting only the distinct ones).

The product of its digits is 25920, while the sum is 38.

The square root of 9945128 is about 3153.5897006427. The cubic root of 9945128 is about 215.0486855673.

The spelling of 9945128 in words is "nine million, nine hundred forty-five thousand, one hundred twenty-eight".