128340417 has 8 divisors (see below), whose sum is σ = 171345024. Its totient is φ = 85448048.

The previous prime is 128340413. The next prime is 128340419. The reversal of 128340417 is 714043821.

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

It is a cyclic number.

It is not a de Polignac number, because 128340417 - 2² = 128340413 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128340413) 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 7 ways as a sum of consecutive naturals, for example, 25353 + ... + 29990.

It is an arithmetic number, because the mean of its divisors is an integer number (21418128).

Almost surely, 2^128340417 is an apocalyptic number.

It is an amenable number.

128340417 is a deficient number, since it is larger than the sum of its proper divisors (43004607).

128340417 is an equidigital number, since it uses as much as digits as its factorization.

128340417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56119.

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 128340417 is about 11328.7429576277. The cubic root of 128340417 is about 504.4147937966.

The spelling of 128340417 in words is "one hundred twenty-eight million, three hundred forty thousand, four hundred seventeen".