128321417 has 16 divisors (see below), whose sum is σ = 151557120. Its totient is φ = 106363152.

The previous prime is 128321411. The next prime is 128321429. The reversal of 128321417 is 714123821.

It is not a de Polignac number, because 128321417 - 2⁸ = 128321161 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 128321417.

It is not an unprimeable number, because it can be changed into a prime (128321411) 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 15 ways as a sum of consecutive naturals, for example, 28934 + ... + 33072.

It is an arithmetic number, because the mean of its divisors is an integer number (9472320).

Almost surely, 2^128321417 is an apocalyptic number.

It is an amenable number.

128321417 is a deficient number, since it is larger than the sum of its proper divisors (23235703).

128321417 is a wasteful number, since it uses less digits than its factorization.

128321417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4292.

The product of its digits is 2688, while the sum is 29.

The square root of 128321417 is about 11327.9043516442. The cubic root of 128321417 is about 504.3899007445.

The spelling of 128321417 in words is "one hundred twenty-eight million, three hundred twenty-one thousand, four hundred seventeen".