128140417 has 8 divisors (see below), whose sum is σ = 130249512. Its totient is φ = 126048000.

The previous prime is 128140403. The next prime is 128140421. The reversal of 128140417 is 714041821.

It can be written as a sum of positive squares in 4 ways, for example, as 29257281 + 98883136 = 5409^2 + 9944^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 128140417 - 2⁷ = 128140289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128140487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11817 + ... + 19897.

It is an arithmetic number, because the mean of its divisors is an integer number (16281189).

Almost surely, 2^128140417 is an apocalyptic number.

It is an amenable number.

128140417 is a deficient number, since it is larger than the sum of its proper divisors (2109095).

128140417 is a wasteful number, since it uses less digits than its factorization.

128140417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8339.

The product of its (nonzero) digits is 1792, while the sum is 28.

The square root of 128140417 is about 11319.9124113219. The cubic root of 128140417 is about 504.1526383760.

The spelling of 128140417 in words is "one hundred twenty-eight million, one hundred forty thousand, four hundred seventeen".