128394025 has 6 divisors (see below), whose sum is σ = 159208622. Its totient is φ = 102715200.

The previous prime is 128394023. The next prime is 128394029. The reversal of 128394025 is 520493821.

It can be written as a sum of positive squares in 3 ways, for example, as 34904464 + 93489561 = 5908^2 + 9669^2 .

It is not a de Polignac number, because 128394025 - 2¹ = 128394023 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128394023) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2567856 + ... + 2567905.

Almost surely, 2^128394025 is an apocalyptic number.

It is an amenable number.

128394025 is a deficient number, since it is larger than the sum of its proper divisors (30814597).

128394025 is an equidigital number, since it uses as much as digits as its factorization.

128394025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5135771 (or 5135766 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 128394025 is about 11331.1087277459. The cubic root of 128394025 is about 504.4850156457.

The spelling of 128394025 in words is "one hundred twenty-eight million, three hundred ninety-four thousand, twenty-five".