128207417 has 4 divisors (see below), whose sum is σ = 138069540. Its totient is φ = 118345296.

The previous prime is 128207411. The next prime is 128207423. The reversal of 128207417 is 714702821.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (128207411) and next prime (128207423).

It can be written as a sum of positive squares in 2 ways, for example, as 7295401 + 120912016 = 2701^2 + 10996^2 .

It is a cyclic number.

It is not a de Polignac number, because 128207417 - 2¹⁸ = 127945273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128207411) by changing a digit.

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, 4931042 + ... + 4931067.

It is an arithmetic number, because the mean of its divisors is an integer number (34517385).

Almost surely, 2^128207417 is an apocalyptic number.

It is an amenable number.

128207417 is a deficient number, since it is larger than the sum of its proper divisors (9862123).

128207417 is an equidigital number, since it uses as much as digits as its factorization.

128207417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9862122.

The product of its (nonzero) digits is 6272, while the sum is 32.

The square root of 128207417 is about 11322.8714114398. The cubic root of 128207417 is about 504.2404908068.

The spelling of 128207417 in words is "one hundred twenty-eight million, two hundred seven thousand, four hundred seventeen".