128394995 has 16 divisors (see below), whose sum is σ = 159408480. Its totient is φ = 99201024.

The previous prime is 128394983. The next prime is 128394997. The reversal of 128394995 is 599493821.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 128394995 - 2¹⁶ = 128329459 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128394997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23219 + ... + 28211.

It is an arithmetic number, because the mean of its divisors is an integer number (9963030).

Almost surely, 2^128394995 is an apocalyptic number.

128394995 is a deficient number, since it is larger than the sum of its proper divisors (31013485).

128394995 is a wasteful number, since it uses less digits than its factorization.

128394995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5174.

The product of its digits is 699840, while the sum is 50.

The square root of 128394995 is about 11331.1515301844. The cubic root of 128394995 is about 504.4862860818.

The spelling of 128394995 in words is "one hundred twenty-eight million, three hundred ninety-four thousand, nine hundred ninety-five".